Malicious PDF — malware analysis report

Static analysis result for SHA-256 656dc5645e57d669…

MALICIOUS

PDF

84.5 KB Created: 2021-08-14 07:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c104909129ec79c34d2285388d81b5a8 SHA-1: 882e47d3508202d513eab68b543bd933b6521be2 SHA-256: 656dc5645e57d6691fa9b6b0e8976502b02e87c1c8f83b68ac0cf1cb91fcc151
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://al-farh-iq.com/upload/userfiles/file/79071976070.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d7e6631205cf9e6e96ddc03572d16510/lozeduxiranefofavi.pdf
    • http://stepasidemedical.com/images/uploads/file/dubedapapowoleladodevu.pdf
    • http://candybeauty.vn/upload/files/98767215928.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1b5a82d747074a0806fba11c45c30dda/40443737847.pdf
    • http://thienlongadv.com/upload/files/tomorojimitij.pdf
    • https://condominiovillage.com/userfiles/file/nupuw.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/0allrcv1ggae495vnabpelcvhm/zosijifalave.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/susekekutubebez.pdf
    • http://ladyqueen.it/userfiles/files/79231832007.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715dc32199d---3660521155.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/95e8ce2f9435548abf21a3dbb8d4d3c1/momikawaw.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094977c9323c---41061508303.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/s86ldres8asougv9n7n3qgnsq3/22822902599.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/74886ad425b3bf3de0c82c66d9c43f97/devevoz.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/tigatevarop.pdf
    • https://wendi101.com/userfiles/file/dufasogaboxakininofas.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/41l1pvs4qd4tk2nc7btclp8p82/52551082325.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/89adrrnr8ktniaksdvnmut2kbp/supokexujaranapagemigi.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d5ba779375b46bebfa14d333658f3022/69278728571.pdf
    • https://alshamiltrading.com/alshamilfiles/file/xalaf.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e2c770b---volokugugowelebesodib.pdf
    • http://bjaimama.com/data/upload/2021/07/file/202107090554074068.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ipl2i9tmgn8segib49vpts803n/jexozupulofot.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/055f683db6a3c7bf8ca3dbe3e1d4e3c6/82136439016.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/makidiwamusade.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=canadian+passport+renewal+form+child+abroad
    • 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_off0000e434.bin
ecceb2e8b34ad41aae3303a61901c60f3636eda10eed797affef5e908c681710
pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 17548 bytes
font_01_sfnt_off00011260.bin
d9be241e07a516c8281dc43c701af677482048c92bc685b46c0c6d9e6c58ac68
pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 11144 bytes
font_02_sfnt_off00012c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes