Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9629e212ed1ef8…

MALICIOUS

PDF

95.8 KB Created: 2021-07-15 18:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d0fbabc231bf1d12b233c29b93b3ae7 SHA-1: b8be692026fe176fa47a6654472b13c3f8994467 SHA-256: 3a9629e212ed1ef8fcddc9d8198e08b2edf3ecde74ae6770416845b54c751a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca22f73111---pajajobe.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/37fbf1604153638779362fede0fa592a/sodababinabasedo.pdfIn PDF document text
    • http://abnicum.com/files/file/12092098117.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/94759955620.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a363f4eea0b---91418080464.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/gutokamaxumidud.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/virevixoruxigexov.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gakosunawugi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ccf717f1133f457f424732eaa41ae201/kolilalelafanuw.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6rqp66fl13755vtrge00l2elo/bunavutijizitikaroz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xisisirolefiderugiluw.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/losekukidugomepegowija.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060703571573499.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/38640465285.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e76010109---betolaledobi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d700020fdd6---43403389457.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/64096246972.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/21767719872.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210607_B175DC4AD38BB566.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/derarumufib.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/23095996082.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/vamij.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a338814dee6---65785066258.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/jizavulotusetufuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=apostle+johnson+suleman+2020+prophecyPDF link annotation
    • https://lapdonline.org/file/rotuwu.pdfIn PDF document text
    • 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_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 11116 bytes
SHA-256: 15c93f93d07474ec331e6e5325d7e2cfc05cf8f2e38f7e14c5debfd201939f7d
font_01_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 17772 bytes
SHA-256: 15375c2fe70b9b8e31eb7925a8baae750b720e64efcc957edff1155ac0684a9e