Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7a1ac5c7078532…

MALICIOUS

PDF

68.4 KB Created: 2021-07-15 13:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4d356152993ea808017de2d804ccfe3 SHA-1: 1de708daec421b29980ff93f3001b438caa18567 SHA-256: bf7a1ac5c70785328ac7367adc597d9ff5bcd8ec4b1f4141b972c86573609a66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only nature and embedded links, a common tactic to disguise malicious content. The heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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://globalcenterhotels.com/bot/ckfinder/uf/files/tetuvevabukelo.pdf In PDF document text
    • http://mai-colle.jp/userfiles/file/sobedavuvonugeseguvekolav.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda21a117a---mawekobevevebufulamazup.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/65f72475abdbba27ca59c42b041dc01c/dalusefevusirulujarede.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f4149cbd8e70532c95890d033500a749/vuxawu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb9ce0c193---50253764003.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a44393d73f9---puxufuwosetazobixuvifafi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tl06lgjaiij8kb1ufci6ua95l3/bipufafot.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de8c58910b6---mozevasejuwavuxusib.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65daabb94e---54955483435.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/58e6f2cc02f3e46ad99a2dfacc0da720/vibaxuloguxab.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7cdc7c8dacdd57f2df932e92c124779f/puradirowanoxagof.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0f44e0b56e4bcdb9f2e6549bf189a85f/vufamazexe.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/betusesugoninopebukalof.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2fcf2b8197e948d1e5a6eb7ae247f159/rapudelum.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/febetujitataxekazan.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/78558350349.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/nemelenuzalalizukotolisam.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607392eb32d6e---88983688404.pdfIn PDF document text
    • http://nova-auto.com/upload/19176843935.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdd3bb572---pevuwamifesokoj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a54104964460c8e616b7352170545b4/sogatawoxekomamokuzite.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/42710477527.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42906150103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wendy+and+romeo+fanfictionPDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 10528 bytes
SHA-256: 78c1d1ddde3eea9b87f741fef4fcbd052007d8c34385f93b5abed3dee098b7a6
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 13720 bytes
SHA-256: 1d8996949a5b751202a7e4a6144122a6150b14ea1f8e832ffc5fc9aed1c529c3
font_02_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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