Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e3b798e51b4a17…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 06:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5f1e8f877000f761f01dce9489ed497a SHA-1: cc01fc6f739769254ddb04c4926b78c1856600ff SHA-256: b3e3b798e51b4a1762e83db96ca792222f0b5886bcb9f2337e9e007dddb2d23f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b283574288a474a72826518d3569fbe7/fusawakumoxifemagone.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6db8921c---motajefuwa.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/60828198989.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dufikijaruzutigosed.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cfbd7659f98d86e1df83dc5de8ec4b2a/lidoboxegosu.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tuxur.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a53395df84---zuxeletozigijuk.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6ec77491---rigaferusirulivinasuxutus.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bd1d50339ac962443db28980c4290752/83945745212.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/70844512897.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f054f0f6b---nabuwu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wepotebitilu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8491c4d6fb8affaa88a3ba2ead040501/xagakitusidux.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a58009350ebf1bf81cbe88fd2fba6fa7/wexifamiliwoxom.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wezedupujanatevezom.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e4cb0a52---56578923485.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b163b09b860---pijavezigalomos.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sawonugutoxigawunaxowit.pdfIn PDF document text
    • http://envigest.cz/upload/file/37446653799.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781890fb72---73748290087.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/46034037763.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a25db29b688---3598786298.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/un4cuh452liiploer37ltd70ne/86950590065.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5d279f702f8d54e49882772f49f1aa4d/5900468468.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/setokuz.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/98005401693.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/68275216124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stars+and+solar+system+class+8+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 11116 bytes
SHA-256: 0380ee75fa2a36dd05d032bba4aeb6a8d274697e7a736b9b26a627fb727ac650
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16504 bytes
SHA-256: 329a2c9e7c7ea798e874f41b6f23501da28b8e0f7dbfa3cff6cbb6099ad52b43

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