Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc656481a231d4b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-21 00:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb16a28665ea04df093703d6c598d488 SHA-1: 970d43b9161edc523b2f36200b095cde27e39708 SHA-256: 6bc656481a231d4bc38fbf59cb91324f0b00d75f3026e28d83f2e7ae5c29206a
176 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains an image-only interface with clickable actions, directing users to a farm of compromised CMS upload links. The document body is heavily obfuscated and unreadable, suggesting it's designed to conceal its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f74q471rc7vijknnkvhg39pk57/xipekozuxapuxutegab.pdf In PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/77258560906.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0cbda30a---kunigunuzen.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/58395270505.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/bujituvefud.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/waxonolipukolijofi.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/95620477743.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/85795811223.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f8db296e586bded0f156abccc46c30f5/basukunevenojebevixogeve.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/bowogobilijomurumojaxa.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/74859451664.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/25210702949.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fadetipejibumilisunaveson.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vutujuradexokoge.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/27262045738.pdfIn PDF document text
    • http://zuche0551.com/upload/file/51624827271.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/nodiga.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210910185532.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/55240399901.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0367a8cf---folavozegilezelewogi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05fa7e647---jupelajegalikivobazigezo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/9280120696.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/63903317634.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jeloxusobugoxo.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/49313133018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=androids+themes+downloadPDF 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_off0000b120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB120 14152 bytes
SHA-256: ec9a14ef20afb462c383c7885c3c50da93fed421e122af5792afc21179ff9329
font_01_sfnt_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10580 bytes
SHA-256: a4a02f7006201ce18c595c2f49c2d086890fb0440c6950b311a624fb44d8321e