Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c95d1982f338a6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28537f5c8ab65b698122068d65464e8e SHA-1: 419a74ed37feb7134411c3dedd2129f07fca9694 SHA-256: f7c95d1982f338a635a549af4631c99cb3afcf444a9de8d377f9e6362583cafe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The primary attack pattern involves luring the user via the document content and then redirecting them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=ld+player+codm PDF link annotation
    • http://enricobarraco.com/files/74474129845.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c99cd6c4a728ffca8819497e27668b1/jagesepivapotuxudi.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/tixotanukavak.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/xuzorovizupizu.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/13189540288.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pugoxe.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1tn4mbve00j1ebifngbsr57prm/91320848066.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/7559170876.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/nilejejo.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/dujerebegejilu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c802ee75---nimebewodagevosadozebe.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/wikokovovek.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/juwaxabe.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zegusigakazepevuwa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0b5d97e5df21b54ef290c72e09163fa7/56391292344.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309330ee18e---kamevasarexafiwotujajo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/xexiwojiwemesibi.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tirunarim.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386aaa1ab57---48377989233.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/55378229143.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dimezemitosexejepitatopaw.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/98458002281.pdfIn PDF document text
    • http://efrex.cz/files/file/gogukefuxabisev.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kabuniwelutesudu.pdfIn PDF document text
    • https://aayams.com/userfiles/file/16949526420.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdfIn PDF document text
    • http://gibisch.info/files/files/tuzapokalav.pdfIn PDF document text
    • https://airbays.com/userfiles/file/95646236534.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 17844 bytes
SHA-256: 8bdbf3b59fa7ef9bec5b16a2aa846377e061e26cd77dd16ec9c25286ff986d30
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 10284 bytes
SHA-256: 2d6072d9ef54646d30877db467398823c5fb6e5d78b3acb801f87b1939242461

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