Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5afe2c66a49488…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 00:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2234485f9614410152c09adbe5e09a6 SHA-1: 88acd37a78af72b9e78fa0d5dbba61d681f87bc7 SHA-256: ff5afe2c66a494889d0f00e50a749ac605db74a5d046a916bb3fbed685814858
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to various compromised websites and IP addresses, likely for phishing or malware distribution. The document body was unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://consulcongress.it/uploads/assets/file/muwibure.pdf In PDF document text
    • https://hearing-outlet.com/uploads/files/202109101515566275.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/48561115660.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4d88610d7f8cf1a3d4df6f81a034539/93008093629.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/56013612089.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/zatipiv.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/xibuserogu.pdfIn PDF document text
    • http://santeh.md/img/files/25063884741.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134932360e5d---10902068597.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc6450063---robujawezi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b481636430bcdccb2d9ee6ba40d8eec8/56133844233.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/48847394374.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/94925919576.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/37564818412.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/46627797476.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/83846593416.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613323f051ce3---45897959729.pdfPDF link annotation
    • https://spvi.cn/filespath/files/20210906091656.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/baxakevirinema.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/23025480630.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/fofipipuduweb.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/7591092628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+auto+apps+downloadPDF 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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 17000 bytes
SHA-256: bf379f57a114d876f9d31acac2e5e268bd36605c6fcb6afdd3e124659c6265b0
font_02_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10420 bytes
SHA-256: 45e216d2cd12aa1727f503fc3f91b5f9b0f79f3a35968cf3f5215f8da2900a93

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