Malicious PDF — malware analysis report

Static analysis result for SHA-256 821815c3afbeba55…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 14:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8773e0cf4b14ec3f8999df96e2c00f02 SHA-1: 0e627d857f2e16b99085fe79ccc7e540d40d176a SHA-256: 821815c3afbeba55d760a86660a08a2470faf531b7caed4bcc1bd650f14a9eee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=bissell+spot+clean+pet+owner%27s+manual PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967e24e5736---papaximoberiganowitunew.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ff849bc9---dikenaxuz.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45857741882.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/20ac02b666d6c2fa9034b8119ff1f4d6/sudewoxetekimulaj.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/740878088.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/59675995624.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/potejokaputo.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/95580808245.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/pajaxefogadunilovagakema.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/vibinulirekufejuvir.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/67653246705.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/86856104518.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/krl3snd2gefmk1g0m1qgthb267/fipufatab.pdfIn PDF document text
    • https://kawanmto.com/contents//files/12215216839.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bo3vsja7scugrimfibsblcdi94/17944313561.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/nunaxuwototopapubejenetuk.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/17068689321.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f70785b0c---tugaxezedisuj.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/vugimakolifodirobikiz.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/ferebizedusamifalo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/ledibulira.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/15529159261.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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 16412 bytes
SHA-256: 6019c60ebad8a4760d6fdd9554c36dbabe908fa8db0b6ae7e66a45d4fb23673a
font_01_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10808 bytes
SHA-256: 375b26d420eab9c2c31c023094a5d258f757384afeece77db817693e8fc63ff3

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