Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c16cbbc2227a46…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 21:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56b97eacf45d722c8ae67e439cc115b2 SHA-1: 9c7c167855de7bccf4bf48620e17ccdc781f3cf8 SHA-256: a2c16cbbc2227a46aaf85a53dbaad20afaaff166d00b84a35e275aee5f814e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=kontakty+z+androidu+do+iphonu PDF link annotation
    • http://artospace.com/pics/file/47610454177.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/rofuvisiravefavalarim.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/tofudozejif.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a9ecd655cd764e6d5cec5428de2cff9/sokele.pdfIn PDF document text
    • http://zuche0551.com/upload/file/12483533082.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/78214158932.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/63679049107.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/85240435930.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/52042638861.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a187461b35---jazafedopuzeraxovu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/9453273165.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89753b44efcce744bf8bd207d6050cfc/xumomivofagusopozibuxi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161362f776979e---34130321874.pdfIn PDF document text
    • http://cke.hk/userfiles/5000117573.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/60708837825.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/barikisutoturawenowaxilil.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/62138593448.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/14283903823.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/libaxununezoxenarawexi.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/kadivefed.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/92295289374.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xosutabopel.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/62863608979.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/negubolus.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/vakikavagafewuvi.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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 18896 bytes
SHA-256: db78e97cd26fa83e5e66f89b0625a8241b22ed5232aab4af4cf3162be5d48431
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 10500 bytes
SHA-256: 80c2fa72d9b8dabe34662f8d53b1aafa9816450690db29a35d6aa066faa9b377

Open this report in the interactive analyzer, or submit your own file for analysis.