Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f071bea1f0a99…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 23:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de2048cc90cfc0a09dcc07a6a65d8a80 SHA-1: d67541b64327a53939ac9dad1844401bda40249c SHA-256: 092f071bea1f0a99f2e4e626e0e0036b08e0972f58c5d8f802ed6f69b32d9332
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://geose.ru/userfiles/file/43224440001.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b74152b0378209fed6c3e35e367f6ffa/63970991350.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a31fa0879---kabazepaxulodaxalokeliw.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/masajoniwaguj.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/86542340299.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/no9o92d63j0d9nunejgs7gu91l/24753723880.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a00a61798---73419827897.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ae1567c322d1b375231bb8f449c3fc2/91178363954.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xefunetuko.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qrb1o66ifpusul4u7qfkk8eri7/75343551466.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/viratobasa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bd44e095---36565902233.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51000503105.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jujepo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c437e6bc026---midulediziwozo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f575a97fe5c8bb1cdf5bd08e543791b8/povulon.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/99297611933.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/rozim.pdfIn PDF document text
    • https://qnzar.com/files/sasaba.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7ef77a6555e6633d33f96398974a8c67/wikubuxobegifikawaweseriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lady+gaga+costume+meatPDF 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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 17256 bytes
SHA-256: bc132e56243de12cb6a9f8983d05ea323dee7a6e33cae038a28a0b88010d7a8e
font_01_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 10544 bytes
SHA-256: d0cc910909dc5817a5e5715b25dc1b0f4763d2d98a3c9f28692659bb3cda9d7d

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