Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f26b08f24c2ab73…

MALICIOUS

PDF

89.0 KB Created: 2021-07-28 08:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f50bdfc096af3171e062fe42ee9d09e2 SHA-1: 705ada8923f6133860c5ca458f7532cf9645116f SHA-256: 2f26b08f24c2ab7353eb014e8a3ff76caac75e35e8bef769d5a68fa6381510c0
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for a fabricated issue, a common tactic in tech-support scams. The presence of numerous links to compromised WordPress sites and disposable hosting further supports a malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://adamlegal.com/userfiles/file/50851416468.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610084261948d---14815850188.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/aik9s58u29thjvnc84sd00670l/mavabesesulepewe.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dea2b634c8aab8f379a9368949876ba0/74413473745.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac0b7d8dc9a066327a2b7b88d0b4aad5/98757115537.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbefb9512c3---3099795564.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4a419eaa69f23320ae1cc3754097091/wubanupibumaxokeva.pdf
    • http://maihome.hu/admin1/file/gisawalufibinuv.pdf
    • https://doganagolosa.it/file/takotupuvise.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160936f8ba378b---pezusizoxaxiveguxi.pdf
    • https://htddienstverlening.nl/userfiles/file/poxinawutarixefozujifed.pdf
    • http://kubabus.cz/novy-web/upload/file/33147182222.pdf
    • http://unipsyclinic.com/userfiles/file/20210524014846.pdf
    • http://vagtteam.dk/userfiles/Files/xapejajamenumuwawanigi.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be85035e5f---63719475520.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/02be0351d546e63050b46735d3da8f3d/fogetitasegopixuka.pdf
    • https://suativisamsungtaihanoi.net/upload/files/wivoxud.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ec010267399bc284540a5dfb556292e8/58116923751.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/29873699874.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96cdddf7be---3753623059.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078335c12526---8512340793.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/74418158206.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be61fd0e06---41915570594.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+bypass+activation+lock+on+samsung+s9
    • 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_off0000f434.bin
8b8e062dd6cfa30ae0b16073decba45008ec85fc0ef85a62aeabb0499222d9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 18072 bytes
font_01_sfnt_off000123dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
font_02_sfnt_off00013bf3.bin
256d84194da35786f8023f1d8e9cfae5c286bfde0731fde77e04af1b41f067b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 11240 bytes