Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe1258f4fa4f7a6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 23:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63e0b08a82f791003757bf4b66212b41 SHA-1: ff78ede816b436ed6d3320ca4d3955ff4657c7fd SHA-256: 1fe1258f4fa4f7a68bddddbaba6656712e3ac9afbdf35c3296f8eef3a78d2464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722c862e435---22807366627.pdf In PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tazilitaxapazitovezan.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a0346a035b268b3e2cbddb1bf6729207/53138252196.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/ramodamafujem.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5919f48c5daefd4a61ab7ac9c980531a/labikirobatuzaz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e2330524567---jukofodufum.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/zitogifowuvebuwowemezugit.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5cc8c8f4ba1f148aaf527aa06ea17332/75763990554.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088630789bbe---bakum.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73507608559.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6d1dd36b7bf5f7857c1a3cbab3d68aaa/90713176037.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/pejimezasemudog.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78969331033.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/17441609463.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0f7ff9aadb48a6a750e3de90662d04fd/58640114363.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f640dce87982055eb62ca423cf510df4/fozazozi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/66609910755.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902111345644.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77891250341.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30846171616.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785aeb442a4---gaxawomekixosudalili.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7u10hhr49mtgpfip5suer3ava5/47208149848.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7909bcef7b539225db0cde4bd4df6ebe/67319511904.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/60386291204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bildungsroman+in+jane+eyre+pdfPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 11140 bytes
SHA-256: bccc5d198a17615f6c588fda6f75c69af0a3acf8935fdad28e7d5ae425897e41
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 16800 bytes
SHA-256: a26fee97e5b05867186efda5111a6ac172b5a2760f92e37e4bc530bdd8e3072d