Malicious PDF — malware analysis report

Static analysis result for SHA-256 39100ecb744a42e7…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 06:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 98e5eba33b898be24a203661d1376469 SHA-1: d2114b55540cf6477ad0cf3fe3dea7f6e3741e44 SHA-256: 39100ecb744a42e7c06da3edb05591516c49607498fe6059c2cfd3d5e00cfb3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1598.003 URL Shortening

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The presence of a callback phishing lure suggests an attempt to trick users into calling a fraudulent support line. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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) or Microsoft license-boilerplate 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://yesilderecine.com/admin/editor_resim/file/84039054406.pdf In PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/bugimabazowiwokajiwope.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/didag.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/45267981020.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141521305874.pdfIn PDF document text
    • http://sbairs.com/datas/files/xumaminipe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06be70cc5---xenitot.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b271b123b---vebapubonudarezemofu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/kobaganumibudelopipupid.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985bd052a66---biwovefazivomozixorakubal.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/bozizeguvojemetosubixifum.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210518045142_ilsvl8.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/dojobugodawozetam.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/93777884963.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/mufudidop.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d38aa3b9e976696c60d10e93882661be/78016239227.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bowafedifore.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pnn9o446j9dh0atmncc9hsg4k0/65001402549.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xedebomuvipifu.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7aac4b59---89621448334.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/lonusu.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/95801731885.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/49590315252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=don+angie+reservationsPDF link annotation
    • 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_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 17396 bytes
SHA-256: db465a408fbe3fd3c99e52b45d57cd23885fa8f7fb8f2c6655c3a96f6562ac44
font_02_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 10304 bytes
SHA-256: c67367e15bce3362cd90abde5f5ed7f313a912682b203f855cdb908d6ae8e42e

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