Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab8a438bc39e96f…

MALICIOUS

PDF

100.8 KB Created: 2021-07-18 09:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2976db272928f5489e5134921c0387c SHA-1: 5c322b08f9aafd593c0ccd31c1992fdf58e04162 SHA-256: 4ab8a438bc39e96ff222b7b890b020d27d1a17fa0fb7b22351e86006adc90185
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sanders-scottfamily.com/clients/26926/File/43469190599.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0dec1a2d0---81146352408.pdf
    • http://capmar.eu/userfiles/file/60662512568.pdf
    • https://condicionamentofisico.com/arquivos/file/39888341915.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/01769039843434e3e40445cb5440be9a/dodinix.pdf
    • http://bycongroup.com/UserFiles/file/nolewogipe.pdf
    • http://ducnhua.com/upload/files/33998123592.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f66fc4e378de5d608b725046b35384d3/roruvajiv.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160746305c38e4---ziriwilufigotiwiz.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe06de291---wabunusadamolimubisudav.pdf
    • https://limsurempat.com/contents//files/91272273354.pdf
    • http://datev.hu/ckfinder/userfiles/files/20233202483.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nnnr727b1974hdhkre1rj3dlv2/96217764015.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63de0ac66e4f98fb32eb1dbaf6eb5c17/rewideneku.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a65da68638d---64539359246.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f98055e8ea1f57c3557405c1abda3e34/mutoguzogunusatawopurufu.pdf
    • https://bbpartner.cz/userfiles/file/fovisixobejukotalu.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/4849801687.pdf
    • http://pro-group.ru/userfiles/files/42653471021.pdf
    • http://altaprecision.com/userfiles/file/20431990872.pdf
    • https://larioenergy.net/uploads/file/84027358749.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chikmagalur+homestay+for+couples
    • 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_off000127d2.bin
68515913a3c280798ba081a0b78509d22849fc2c2ec9ce6af79264996da8a9af
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16896 bytes
font_01_sfnt_off000153a5.bin
810b30f4c1c133a6045a42346e46a874fc61fe8758f04d35dc655a2e38c1f5da
pdf-font-stream PDF embedded font (sfnt) at offset 0x153A5 11160 bytes
font_02_sfnt_off00016dd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD6 16792 bytes