Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd145677eceef9bc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb3a41aa0903fab90c6cb57662933d27 SHA-1: 818f0d5570950b275ee46d06720ebfba19b118e1 SHA-256: dd145677eceef9bc64b6202993a7fc668c99e40e06758358edf34a14627cd6eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, consistent with phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://nomylo.ru/uplcv?utm_term=comment+couper+page+pdf PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbafc66a5---xemunomitapovativuw.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108040651443494.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/zelulojesezijalos.pdfIn PDF document text
    • http://bio86.fr/fichiers/nerapofawizadoze.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/19275036056.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/41979712396.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/padilomo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/62720557520.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624b587180---77178463119.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b3e890258fbb3e516432f15e1201097e/jelixaba.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/betib.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d3e0ef70f26b8bb2cf197b61043ebb49/48334420267.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210807075332.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/23746832775.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/kinezukaku.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/kuteroxudilafi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zuludala.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/bikudarawevafetodejuwuv.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf465088c---gituxuvabemab.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9ktpp8ftnb52g0riuao5vukmha/takom.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/rinipexij.pdfIn PDF document text
    • https://fasleh.net/Files/files/veraliris.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10788 bytes
SHA-256: 03e9c9f5cb2a0a089a9ab730f823d18bf42b3b2a93a27536c2c6e2c50ac008f5
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 17592 bytes
SHA-256: 2325b2033b9fbdac81ddd361bf48a6b1145c1888d63b66960b50c990e5426de5

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