Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7d27121fcf792…

MALICIOUS

PDF

73.9 KB Created: 2021-10-13 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 48d6eb6712c5080a434274758707b36e SHA-1: 80af9c7aaded21d59181cb222c45b3f243d2e1e8 SHA-256: c1c7d27121fcf792adb5c0bb552c0abee0681975b3e0c2aae691124aef8f886c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://villa-carlshorst.de/sites/default/files/file/revusozin.pdf In PDF document text
    • http://1472bond.com/upload/Fckeditor/file/24936103201.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210921_07DD0869215823C1.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ee7ad004ac7f27f190da74e1d0322672/vatekomit.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/4276261316148e654582f5.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/69823440247.pdfIn PDF document text
    • https://razredna-nastava.net/files/zakuxobajapitapuv.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/1145070953.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/61591877504.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1632563632.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/mevasuvavu.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zesirudipejuz.pdfIn PDF document text
    • http://tennis94.fr/img/pics/files/sezifelebuje.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/pepixoba.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/55411900107.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/xitodabove.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/jitavofupabugimozawiwiren.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/36679850571.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/83208547875.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/73c851a5ab38f49965e2cf1ebdd75b4c/9345891231.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150d0271f4d8---39857687998.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/42262471280.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=pendal+group+share+pricePDF 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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 17792 bytes
SHA-256: cbc6db11ae1ac58a3a9733995f491cc216fc47416d08f044906518fa8ecbf417
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10796 bytes
SHA-256: 36e05dc1a14759099560bdd2a0630ba114147fc58475694a6c7f6d7f0b938aaa
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1