Malicious PDF — malware analysis report

Static analysis result for SHA-256 69901718135a7834…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 12:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d624a51aa6a527fdabd9337da0ab5fe SHA-1: bc8519b14b9668a91956831ebb8d13cc1607fc06 SHA-256: 69901718135a7834fb3ae133cb03c403b15551f793e49ab671436bb3e9c8a8aa
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. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hantverkarenisandby.se/UserFiles/files/besugaxejenulej.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c67dd4d64cc63659e069b36a8fd60fcc/85468418820.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/bozofilozij.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f354701da---87896353474.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e4rbcp4olork9rj6fkglbbbra3/mekifufapobuvekepa.pdf
    • https://michelbarbot.com/upload/files/zizagax.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/1789143496.pdf
    • https://speculatio.in/ci/userfiles/files/lerogowetiborori.pdf
    • http://kapelski.pl/userfiles/file/26006833777.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff3ed9a5---65697545825.pdf
    • http://dichvuhieuchuan.com/upload/files/34538008311.pdf
    • https://sealskinz.ru/files/file/timejifumivuvol.pdf
    • http://1-cx.com/ckfinder/userfiles/files/feruseferaxar.pdf
    • https://zhansq.cn/upload/file/58245790194.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac001c0f42a---93568556622.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/73729bf7a4854b5dd1dc6d45b6a0540c/pelojuzozibimi.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8cd70ba51---94535968674.pdf
    • http://etasystem.net/userfiles/files/26306108087.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/zimofagoxixabokuf.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/36b15048ed1b94b5391b30ff2cc0e09d/45541869305.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732cfb91e82---mababugiwi.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/71013c1baf21cf59d3afdd4a705adfc6/nunanolekawujulomil.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a83c191cd10d329f8dd18e01da459e65/45538446771.pdf
    • http://defhjdr.friend-match.com/upload/files/76803829469.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=signal+detection+theory+in+psychology+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_off0000ca00.bin
b95f4149fde877c780f3e77aa4d8190ddf201fd6c59b9e87fb2abc96fa606773
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 17232 bytes
font_01_sfnt_off0000f628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
font_02_sfnt_off00010e3f.bin
24c6c2efb006920fb1e73229815eb9d37f2f8fcc2aee84dd4843f6b5fb2a47e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 11088 bytes