Malicious PDF — malware analysis report

Static analysis result for SHA-256 839c1b6413995123…

MALICIOUS

PDF

80.3 KB Created: 2021-07-06 04:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96f7152e0df8c8886d48d4e653ad1907 SHA-1: 25a313f304c51f2ca5d73e3a42e65d8172f05e31 SHA-256: 839c1b6413995123b9ce1202adbddd9c9a47071408518ab0e214f07e6d40ea4b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6ff5db99---lapipavubobamopabatox.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uic16vpkcv8cpd3im0ou3rbge7/56252983439.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160989a6727a8f---lififusesinomopudejana.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bcce1b6bb---kagob.pdf
    • http://saga.diamonds/uploads/ckfinder/files/49673712128.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086a25df2d05---ralebutuxajuz.pdf
    • http://dalaichau.com/files/razorimuvenotivefanam.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b66b7a023---koluxikuwu.pdf
    • http://119hero.kr/userData/board/file/11635632536.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160756cd5e8fba---vizowu.pdf
    • http://akkoryazilim.com/userfiles/file/83879321402.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cks7htol1ajd3fd5giq36iqmn3/buximelulolike.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67cb798a73---13500877675.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/52003919324.pdf
    • https://kompaspt1.com/contents//files/74335550385.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xozowusagogavevijejiso.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f199570001---lokikijeluvosaduxizemizos.pdf
    • https://securitydm.com/slicice/file/79975800047.pdf
    • http://gandolfiarchitetti.com/userfiles/files/pogevokiriwebejumujekezuf.pdf
    • https://muzeumkonstancina.pl/attachments/file/jerapofavogagikibuzudaje.pdf
    • https://tungqibiotech.com/upfiles/editor/files/mitoketenetasokixik.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a0ce6f27---desafurupotato.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pujefasomif.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f621743---13512680667.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607540be350e3---70965380679.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hairy+nude+moms
    • 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_off0000db72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 16792 bytes
font_01_sfnt_off0000f389.bin
c51b564dfb7815b599ae243c8b49ed71e040e57cd818ec98f087adcea3f79277
pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10472 bytes
font_02_sfnt_off00010b3f.bin
b56b05516ad7a0bc9adafc0ec6ab33bae765fc64d02e469e7bd580695b1412a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 15992 bytes