Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ea1852e802e4be…

MALICIOUS

PDF

69.2 KB Created: 2021-09-03 00:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56ef067754fe9e7d63ff01c55dc3db93 SHA-1: cab49ddfd8e50e3065d20bfaefdf7d9e07c8173f SHA-256: b8ea1852e802e4bed2c3147ca73b39e518b09f9d6a2cd6b84c77aacd33245769
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and small file size, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various potentially compromised domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://jump360.co/upload/files/20210707054215.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc160e9a---tutenobivadora.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210626215920848.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af384334f53---25190752629.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/lujolowape.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05b084993---3315132724.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/bisaxelajuvikorif.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/89785339504.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15044653097.pdfIn PDF document text
    • https://ms02bet.net/contents/files/55225086062.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/7763f05bedc0b99d2b1323f15404fe8f/mulebomipazevosus.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/6c8908df63ac43b3aecb69aef6bcd648/9168031952.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/85818942bc7eca2f785bb1322cb6df4a/pulumobabudadanokup.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/moroxikosetobesuniko.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d63b38d5---71474037010.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/xibumi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zexugojiwi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nogubepirigonemojidokijur.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jakotateginuvotajazobo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161030bac2cfe3---74947919613.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c618a60952---37107235424.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/18129005449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=amoeba+sisters+transcription+and+translation+worksheetPDF 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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 11080 bytes
SHA-256: 0a29c99e35267e8d2e0cd0aaecc6a75075a9e5983d8f10651c0424ab4ab7d6a9
font_02_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 14088 bytes
SHA-256: 00a2fe19491751e915bc1e8803045d004512399d96fe9e89242ced61ce8f4c5f

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