Malicious PDF — malware analysis report

Static analysis result for SHA-256 55346efb0fa12ddb…

MALICIOUS

PDF

70.6 KB Created: 2021-07-03 03:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce0cd95ab6eb6f4b5104a9941e9186ab SHA-1: b6d7e12bf32e8a1f4d151a0af1b156c4caef8749 SHA-256: 55346efb0fa12ddbf6c90605fe3d4332d9f895ac6dfd5a5794cdca9db7d48da1
196 Risk Score

Malware Insights

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

This PDF is designed as a phishing lure, using a screenshot to obscure clickable links. The document contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead the user to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • 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 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075805f0ad4c---beribomozulugoxururapod.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5945f39f86---53333310313.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160963830dcb18---742619198.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/56df205ff52f3c496d181d70b3999e01/93343599118.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6faa953d---metijupoxepanakivigodexa.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b00f5393fff339a7077edb6080e781c8/butekinati.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/zimonoz.pdf
    • http://elma1.ru/!upload/files/43493206439.pdf
    • http://szentdorottyapatika.hu/files/sigufuxezekixot.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160785a59bb0a4---98540565398.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rkb4q54ufsutdbjoncojbs4gb2/fobalivatikiwuxat.pdf
    • http://christopherspubandgrille.com/userfiles/files/pazegijotumuf.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35e3ee32---48491792820.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160758efef2971---meviz.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756d95ddc93---tolevawof.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c66ea383---vonagaxuwumifuwemotalizo.pdf
    • http://danchrisjewelry.com/userfiles/file/63608203175.pdf
    • http://suvagcentr.ru/userfiles/files/75715592880.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609626a13b729---tadexorilasaz.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/rogamabozik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d3fded26---38000654908.pdf
    • http://kppzp.pl/userfiles/file/40583073281.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b114341a3ec---gefopewezexekefikew.pdf
    • http://gintaras.cz/userfiles/file/munomenenilomimuzizodasab.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090dabb8f644---68845373282.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/m4fn5ui15k69fbjboqbu85ig12/tarena.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6f59ac0d---rukujifi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+laws+of+human+nature+audiobook+mp3+download
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6410197f3d57abd75c3a9065880ccc25/17193734193.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 16792 bytes
font_01_sfnt_off0000cfdc.bin
6c4de889e0ecab7cfa7d48aee8eec10bc5fae748c9cfbd2a2a03ded3d97d902e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 11316 bytes
font_02_sfnt_off0000ea22.bin
9f9eb65de068d49cbe4ec023329a334fa59726aa30c0e34c2d935dcc83db0a00
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 13648 bytes