Malicious PDF — malware analysis report

Static analysis result for SHA-256 66617afec55d6519…

MALICIOUS

PDF

71.5 KB Created: 2021-07-08 06:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e785e4529a7d6fff4c843028f458250 SHA-1: 6a41bb62590df11769457495ce424c7008b9f6a1 SHA-256: 66617afec55d65194d9b31bb3b8935f1dac8cc16d89cb167ac65f23cfa0e4306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it is used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=nature+of+the+bible
    • http://bertrandetgastineaudesigners.com/userfiles/file/47131189778.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb3a0a187---xazefigajogiremof.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9e86b65c64816ce4c318cb5d27c777e4/98659837672.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890c7eb5b4a---fokogetumogixarevazawat.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/17488293248.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7aab82b4---negujagox.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bbcc79f76e421ea93987113a8a704975/beguj.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629bdc1513---97721009841.pdf
    • http://ackerviewguesthouse.com/userfiles/file/jekimovirev.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc9b0ab4f---zasawuwirafeti.pdf
    • https://bouveau-consulting.com/userfiles/file/53456673153.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c5d65ab8---66031718346.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa9a14d6---38240357031.pdf
    • https://wrd13.com/force/file/jizugowutemitak.pdf
    • https://maturana.cl/upload/file/vukumunesidokufuka.pdf
    • https://mkontakt.pl/dat//file/fuxarelukofawawap.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aa378703---viwefunitokonizosowi.pdf
    • http://animationcoach.com/userfiles/file/413249236.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4383c09f51---56356888282.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b24747b192fcaac9c69e04a67135058d/kunawaxiwoxodera.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a1fa3b714---85303876764.pdf
    • http://cga82.com/admin/File/fatotimilofeganunura.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607159e0e542c---nikoji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7f4.bin
92b66732edf09e8d955e2c8763a29b6a5003a6fccd4aa36c8831c820aefd4be3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16228 bytes
font_01_sfnt_off0000e184.bin
ba9351c24f32cc8d2e3176b322749f21a3fecd55bd2211dda98d0f1b2f771d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 10256 bytes
font_02_sfnt_off0000f8a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes