Malicious PDF — malware analysis report

Static analysis result for SHA-256 780fdb6c4dc38345…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 18:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa059044771b050b89bef8c6d8af9619 SHA-1: a9162eaa08f845e08160e0a2aab376116fda4793 SHA-256: 780fdb6c4dc38345afed3c64fd3b41b9b2a89e497396ab01792b161141d64fdb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afcc33ef1---57476256273.pdf In PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/37961480650.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/55530403492.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/15009630670.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wenapujopipati.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6b3d54b9---53776352520.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/78867918470.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qp7rhjre6osi3s3jahc09j80ji/pupozatunisomebupo.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jijanosejakegatenilozan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dada48324---36446681530.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/pusorawufugebuvug.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a040ba4df---disusu.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210626_065011.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hv5tdrb1tl83lm0bd48ftcbml3/balijutimolat.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/13413690881.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/39921287587.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4b2db5c92e4092a76880460d0c4bd88d/79613714220.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kirogupifid.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2d565efb3f647ed6c5f60ef2fc9321c3/fenurafukitotisawizes.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4e110057---likobisepukowivep.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kdn5g9g2sks00p7i5vl66gb4ro/rozijelibebuxokisebos.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec55ecaca0---63400189621.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/32788e90981360bfdf004c7b010d9477/45747873644.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/27376100349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=about+noorin+shereefPDF 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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17160 bytes
SHA-256: f65fc54abb3aa4c0ea20d7d60360e0bf5bba576752483c76cf1c32afd12e2a0b
font_01_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 10324 bytes
SHA-256: d9a3c15a445e8792bdd7550e5c75c9a799f92037bcd2ad1d2b90ac1f9634c941
font_02_sfnt_off000135a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1