Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aecc34dbfe15c71…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 07:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c4520878ea617b0785ebfc19a0df80f SHA-1: e6550d67bd94187a39bd7f8cbbad9cb28659ff6e SHA-256: 3aecc34dbfe15c71ab496f707b8baa1dce1f2ccda3c6719c25feaf20bc3d8214
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains multiple links to external PDFs hosted on various websites, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malicious content via link farms. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nowyhotelik.pl/userfiles/file/77818348706.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/wotaxomavisobumokep.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/katunotubadefudakuvilili.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/dukofi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc042ce50---37069285559.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/gosedipobofi.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vuzivejoxon.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nuzanetiretar.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/62010118978.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/venuki.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a004065f436---lubowikaxolig.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/330122cb6bd01a2d85e35623ddc92935/xubitogizasilegiratapa.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/jizejap.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081585327bca---mofinetikax.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965e21aee37---lixer.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ha73n2mbpcgc0ac3g29bslp004/53324884009.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/lamanin.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93126537e---78978561377.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/69267037597.pdfIn PDF document text
    • http://fabtur.ru/upload/files/28457365607.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/semanagugopelemajiliju.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a35669d72---bokanel.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tenupezuxakodiwukul.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/gejax.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/74629228525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=precalculus+with+limits+4e+textbook+pdfPDF 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_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 11380 bytes
SHA-256: 466a761c9983ea69de460bcf8517fd89853b7bc26ce39677426bd8dc7093cdad
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 18132 bytes
SHA-256: a823b5d69a25df2bfa21899b6a0800f017a2bc0f06bfe95be19c82ecc32491e3
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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