Malicious PDF — malware analysis report

Static analysis result for SHA-256 80670c9871661611…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 15:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d53890f96c90701839ef103c98a7089 SHA-1: cb391ba7a99e6cee66845bc119b4c619bd229344 SHA-256: 80670c9871661611b37c25960c501c8691f0b9f91c0f3b7a3857283e06ffb112
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=app+for+zip+file+android PDF link annotation
    • http://maxidmum.com/images/upload/fck/file/bokokojoxodanajojakana.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/lulegupo.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/84554034365.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fejavudusejizekakutotawi.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81464350482.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cljjm4d9jrefb9kf5v977tlhk5/tamuzulugoxal.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/derubugimisekega.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/470a6f5e4a203b5f4efa5b541099d187/vegivazawofugiserunelixon.pdfIn PDF document text
    • http://secretinvitation.net/images/files/31106320004.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2ce674a2---46736832061.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/76436558707.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/96903757287.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/besijesu.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/90868760192.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/15571216021.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/49615025022.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/5929175396.pdfIn PDF document text
    • http://tdbm.vn/upload/files/58269200625.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/92334517309.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bovagedoletojutewowajas.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/fexifaxusiz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377db20ae69---xamudunuxedapuwerop.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/7691908324.pdfIn PDF document text
    • 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10268 bytes
SHA-256: e2a810ccd8758e286b704a3937aed3226da8f5b5d52c589437323e2f190a41d5
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 17332 bytes
SHA-256: 0835a4cba5f921dfdfdeefd0fcec5c7d8965a8c16bed4fee4fa2dd564a7ba39a
font_02_sfnt_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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