Malicious PDF — malware analysis report

Static analysis result for SHA-256 3795cc689bde3ed0…

MALICIOUS

PDF

101.9 KB Created: 2021-07-20 20:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b69427bf0bfab3ca4ea0ca9a98dad673 SHA-1: 41636d576cb2b66b5f2c0382032f883e428fbb94 SHA-256: 3795cc689bde3ed0fd2a660f4e9c9e5fc3184241a887741d80007c19da73d590
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. This suggests the PDF is used to obscure malicious links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://cpsguffanti.com/uploads/file/wotirovokerorilibonij.pdf
    • http://baigeleather.com/userfiles/file/fafibajopiziwu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609136abecf3c---vemuzegebonob.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d962db2e7---senox.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ba74b30c---83381809201.pdf
    • http://ddgasul.com/userfiles/file/tuwagilam.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/62467231237.pdf
    • http://murphysbeads.com/clients/54316/File/15109033567.pdf
    • http://polipack.ru/content/file/4617769527.pdf
    • http://www.pattyn360.com/upload/forum/files/88112117511.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4kea7srsfi656hijbqaa22mdib/84870229566.pdf
    • https://suma.ca/upload/editor/file/sitinadesejedezu.pdf
    • https://acronimocostanzo.com/userfiles/file/lejafuritofofobape.pdf
    • http://coming-c.com/userfiles/file/70448569046.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/f65cesm1t6nmgkn9g4moulgq72/38652900351.pdf
    • http://studiosimonepantaleo.it/userfiles/files/xitixakiz.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d2129b0---tenusib.pdf
    • http://alexlunacoach.com/img/editor/file/paworarodi.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd295e41f21---gamexaj.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9b83a2bc---mikodofuguli.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9829d40be457f34a27b3d8c5a1dcf7a/82289019281.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1e8aebaa3e7316e6ed7096e8f3e724c6/gagelopunufalokexawudeg.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/84c55634486cdce4711b47123a8443e7/mumonokadiwon.pdf
    • http://ansing.nl/userfiles/file/dilakewurojataziwatezav.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ab04ab2a---bunotifesifuvadi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=classic+wow+first+aid+150
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tavadininofovozanukajokaf.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/af401f3a3fcebc53885ca8bda5c1b7f2/62159846663.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes
font_01_sfnt_off00012d27.bin
88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16340 bytes
font_02_sfnt_off0001431a.bin
bbc4461852ca5afaf4d662d469ba304121c6e3f3a9371a73929ea397333a3946
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431A 17440 bytes
font_03_sfnt_off000170f1.bin
51e5d7d6daf3ae5ff23b570b2a065d6f8192b47e647f393221107a78f0c6f736
pdf-font-stream PDF embedded font (sfnt) at offset 0x170F1 10656 bytes