Malicious PDF — malware analysis report

Static analysis result for SHA-256 340af662e30f3437…

MALICIOUS

PDF

95.4 KB Created: 2021-07-19 23:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bd5b25f60115e38e538ad633dec7a07 SHA-1: eb12049b90af416150b3571cc85c1d703698a13a SHA-256: 340af662e30f34377aaf94a2a37c9511060203ced15f46bc5257f7e4d13916ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and numerous external links are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/potogurepatujofizilitij.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082789333daa---nirubefatorug.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/s4aj0gfnvk29a5j2r1refu1hr6/xurujobenexabujoli.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/db0ef6b6885d7903e23edf2c964f8bdd/17565648406.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0697351001624244757.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/54651441473.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7a686511---rorobagozes.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2f64b719---gemaf.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de8852c4f---17534554074.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/89042397324.pdfIn PDF document text
    • http://beiks.info/public/file/86053226247.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6f1bfccd8ee1bd4c44da40b85ab04aaa/nigeronaxarosinixid.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb49fba5---motulexarenipuv.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/44467005974.pdfIn PDF document text
    • http://toonesk.com/upload/66094329544.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/98345302486.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/putaxewatapolexuxil.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/66006339499.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160766907a1241---52272897488.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/28775350249.pdfIn PDF document text
    • http://surtek.biz/image/files/20150101_084235.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/54343100469.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/volosumepizebelelete.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/91920305457.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4bf411c7f8d047d1edacb11ce1d96e2d/28657546599.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1d774a9719ed82ac68aacbe9d110b90a/zaxuvovivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rexanne+becnel+booksPDF 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_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 17728 bytes
SHA-256: ef70db9f387f01be01e5cc29cc80df30f6c8965e43cd066f8b62b4f6a7e4dd37
font_01_sfnt_off000140e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FC 10312 bytes
SHA-256: 6fb3c306f318e674e38273c2f58d346ec301df05d750e78995aee72b6ef1a832

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