Malicious PDF — malware analysis report

Static analysis result for SHA-256 699f4ae6bdf61c35…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 22:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ce3e5fce48976a0917cdf6d57adaf0f SHA-1: c2bc53c38a33897bdc0c9f5b1c0c0df80c51ae28 SHA-256: 699f4ae6bdf61c35b32c1b562cce1052d8e0873cb21138a7de516b2dc2959650
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uqfjbbddc9a280sb5rquiiktl5/64116015187.pdf In PDF document text
    • http://adice-area.com/pictures/files/wetizuvupanilerajivo.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/14935455706.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/taruvovukefanobu.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/rowivukaduzenepanari.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/blot1q2j7gp6ohor64eatlb384/mezigubiwekowatidajex.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lejepipitowigadewifetero.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113bd24edcb7---nimedisolozizuwirekas.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/47614183493.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e62bf1107ce---fexuwojaxuvilonumibujir.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/37040242084.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/85884838841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf6863ce3---kulekewopimukuzimeb.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/409abfde1f576c234d743a06225a1fce/sokegamewarakok.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/5087231612.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/61491319468.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447a5080c6---wosijus.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/fugobetilisome.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/28faffb82287f2f3ee9f65b94111eb9e/nipulubadapakaxomofefi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c921867f3---jogexomapogiju.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/33269040939.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sijezalasunikodetebudum.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/768920aaffa55416aa8d5f6f5c744ecb/83724501072.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/74891221671.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dupupazuruwotedorozabewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diabetes+in+pregnancy+guidelines+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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 11028 bytes
SHA-256: 2d694a2303e80e5d5a8b6ac28770127eb5776bde0b4e13f20607e7a2636ac6ce
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 17312 bytes
SHA-256: 8fd4a9649aea7939618f5d14155dafe56b3af26b40c0adcb5f5b71ae30572cbd