Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fab1f3e7c722b2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 13:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad5527088f5e80e0a57234ac7d1fce09 SHA-1: 27c0ba5862638db6b9e332398d081c410fcff951 SHA-256: d3fab1f3e7c722b2b6e0a9556c367a26e80fd91361bf9471d365700f51fd1aa4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristic firings point towards the use of web-based lures to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zrdb-drogbud.pl/Upload/file/zetamu.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bgihu1t5ppob9hc5jounttvcke/gebotujazomapox.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fee964a67---xusofefema.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e05a6c95f---68082765540.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/87967494731.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d28772160---rezazulel.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/nunopusufejamurumux.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/sezodisudapevupo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ff71992b---41237877136.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bupibar.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9254450db6---rozibizesawewatedowo.pdfIn PDF document text
    • http://turatabor.hu/media/88824946739.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/30122663859.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wibigamomurawifenuduvudu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9g3ovm06sojfo56s9qimr8qja8/63415658558.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/41754833975.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a2f1d73e8f456dfe40b89bde42f6c66/16050470014.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/26853038137.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/basapozafolige.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acf9f03655a---53869018628.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089aeeee9dca---mavowatudosiluxu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1176f19374---bujanexabumefotaxupiko.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608397ce0f17a---somategike.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7419c388e4ae0d6379d702521d1a74be/pizixagupezegi.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/bazuduxidetovobisosak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=trading+tick+straddlePDF 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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 17544 bytes
SHA-256: c0cb0d5d50d875e90e1d9d1128ec3f63143322888c62c3aa3899f9b7ef81195c
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 10480 bytes
SHA-256: 00caf303ee029e7c1a73b3e35ff675dc85843c747489adb385d3c7359553dff0
font_02_sfnt_off000139d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1