Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c81923838368b…

MALICIOUS

PDF

102.1 KB Created: 2021-09-08 09:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 845f8eb5490472f1be380c428cc70482 SHA-1: ba4945089b2964beec0e561209ac1644b3577d14 SHA-256: 684c81923838368b9452722df52a0fc006137160b85742919a8a6173949d25b1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting it is part of a phishing campaign to lure victims into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure for fake tickets or fraudulent charges.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://krisoc.ru/uplcv?utm_term=get+railway+e+ticket+pdf+format PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc29818a24a---31413964458.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077363905e84---95169661127.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/pawirevutati.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607823aa355ac---jofawisijaluzutok.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ih6tsdp175ttcgrs7vrvk2hif4/97328378073.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091681738830---40734475619.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/xemelula.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/vesipokiju.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086040c0ef31---68975653641.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/gixevebitesu.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/4e2a9bb3e3cb2dd41efd3aed290c9a01/51881766311.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cbcf1aaa375e98f63b7387f6ecb7f82f/3670637928.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3adfd9b09e2bb669fee55d33ae369117/vilumuluvo.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/zinemavapetiwopi.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf968dca23---befakigo.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/xaxozilugudivogevu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/08/14081301803.pdfIn PDF document text
    • http://recrute.fr/files/files/mewibib.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7236d23752ee836dd68885535f9084b7/vuxutagitobo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706efadf4ab---44092244525.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/33658431587.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 17956 bytes
SHA-256: d573c2cd33b1bbf3a3812c0a8c30321f47e73dde768faf4d3c118fb3472dc5a6
font_01_sfnt_off00015954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001716b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716B 10840 bytes
SHA-256: ffcfd9c3ec55830614e0121128ae2aae9f896282be6d1829483811b0665a2b15

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