Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d77af3db62b099…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8e357ab8475cf2d22c244b6664b01a22 SHA-1: 4061da0073f016454584e666b43010c3296ca9d3 SHA-256: 10d77af3db62b0998111802ddd33c3f698cf451b424e3a763a55efa27b29a39f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bd4c33217fe318e3c0858ee44822dfc3/fewofepirutedipizilox.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86c118b717---71760018510.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/dd625e5090e3abbdcc9e99e4220ead6f/wututimoveluwepizit.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ddd1b8f0e31d0ba584403aeeb177f3d/74096222171.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/2715076409.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b3ccbc7a6c0de8a28ec7c5c6f98278be/73606469376.pdfIn PDF document text
    • https://bdata.vn/upload/files/gobutijapepavegetugus.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b5fa423c---91177072201.pdfIn PDF document text
    • http://pakianco.ir/data/image/uploads/news/files/safidimapozejozaroxukej.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/58647958378.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46150bbd0---86780667685.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/85683660224.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/dawuj.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wemerogid.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadf8cc7b9---zelusatemiwuwimebej.pdfIn PDF document text
    • http://debten.net/UserFiles/File/73933998334.pdfIn PDF document text
    • https://iwistw.com/upload/files/58800286372.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ratesatiru.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/98962040324.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/185dc4dd000756a57abd08c7962bc950/vikurifuku.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/lilokasekigujigikojo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/55048380716.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5450ab189471a83f965db7d88a7161d8/55281350536.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1925456930---80750888178.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2cbcj6ddf55vgc3m83r4gibn5j/zivexozowapamutud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=multiplicacion+de+monomio+por+polinomio+ejercicios+para+resolverPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 17628 bytes
SHA-256: 62ce6ebb1b592ea0325fe063263329980229db6d4f03036cf80641b870aee7d3
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 10964 bytes
SHA-256: e8ff829f92d6bc2dc72b9fd9e8d64ecf20b5dd54c9718e230e9cd61bca71ea63
font_03_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1