Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0f5d90b63d4b04…

MALICIOUS

PDF

94.9 KB Created: 2021-09-07 15:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50d453bc0e436f94fe47e754e23816e0 SHA-1: a59f4b7593a556f27019e77f24ce6ae87d8a3539 SHA-256: 1e0f5d90b63d4b042d93fc41ba3a73d1cf15e90fb99b0c2e409247875dd94398
216 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or billing fraud. The presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests an attempt to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=auditing+and+assurance+services+15th+edition+test+bank+pdf+free PDF link annotation
    • https://stallion-international.com/userfiles/file/9712432694.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/39622994497.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5935218318b61a5ad35ffd477f4dd7e/pobatemodukejes.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/bifobez.pdfIn PDF document text
    • http://bociany.sk/media/file/suguf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59cbab435---58659611953.pdfIn PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/bugixibekaj.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/49020653311.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/chtgqec4qde2mkn95rvgiqtrv3/2526982799.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a8cb1c9f504538b96c4bf2cf107c0df7/86807138114.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd282a7f05---74455343627.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/wubumowoduf.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54034163495.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210717133427606.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/476797b8c830958d040fdc0860e160ed/libilubava.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf21beaf2f---26106809357.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/ritaxefosur.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/modofose.pdfIn PDF document text
    • http://ahchala.com/img/file/26758143181.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/32235009946.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf876f452---lenomakopiturupufaj.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/japagap.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/48070488323.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f62fcf148---zipatidedazebajiw.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/90287871877.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_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 19176 bytes
SHA-256: 13c88ba0af3ae0e42d715220ce8ceda6efb6ba5dda3ef64fe298168fcee01766
font_02_sfnt_off00015282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15282 11416 bytes
SHA-256: e356195dcd4e5e1ca4a60e9d4e7a2cadd6a5c267300774818a3bc333b101c05a

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