Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e6a2aabb45ffb7…

MALICIOUS

PDF

100.8 KB Created: 2021-06-26 05:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9373bb4c62046024c1f1945a4f946205 SHA-1: 28e2aba070126f1e1e78447f5b1efdfbc1399bbb SHA-256: 28e6a2aabb45ffb7ad188862026a661d27a8d3bc4f3dce5276cfb36918115297
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by both a machine learning classifier and ClamAV. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfdb71b51---bimuroxurogaz.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f7a0244de3e04224c36bbba8ca5ee48a/22742103416.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1de4c6ddf---12976616234.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7840eef212---25386837830.pdf
    • http://beepost.vn/upload/userfiles/files/98015793503.pdf
    • https://promobryansk.ru/userfiles/files/pozurog.pdf
    • http://10glazsikeyrosa.ru/file/dajowuxax.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8224f695---69100461405.pdf
    • https://cottingham-group.com/cufiles/files/14356623671.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/16903035068.pdf
    • http://dancephoto.ru/userfiles/files/70953317899.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/punikikipuda.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9acb60e29---jojeko.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ebd6135c---libedizavoru.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d535255f069188ffd4a21f2061871d8c/getudoxabizupokose.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44141d5e7---60394378626.pdf
    • https://medsplus.us/admin/images/file/80756535967.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ed6e2f3---32389367545.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/adba61a76679c077ee192877da90f8fc/86130589359.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ae6042df---wubovilag.pdf
    • http://amctop.com/board_data/editor_img/file/202105211111.pdf
    • https://alternativecarrepair.com/userfiles/file/zefunatoxoxolawejamuv.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090eec6aca2f---81125320634.pdf
    • http://imi.vc/upload/files/kebulopegirekok.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2ab31dc2d7d79fa6388a675948286580/174613604.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=metaboost+24+hour+fat+flush
    • 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_off00012269.bin
6da325dacad62d82ca5d943c1dc6457fee2fbd8f121124e1321840cbcb47290c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 18748 bytes
font_01_sfnt_off00015415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 16792 bytes
font_02_sfnt_off00016c2c.bin
c25d033c8f8b2b3dd8aa438e895f246f8388bdf0872f078cbe033fe7cb481c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2C 10548 bytes