Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8c09b773bbf822…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 10:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 220865244cc9a590a78f7c7bf31c7272 SHA-1: 6bd1802d9ab517b896d8569bae0931ec7fb0e686 SHA-256: 2a8c09b773bbf8229a0425eb4d09bf71d548439b489d3c8127d0c108742dfc4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, particularly those related to 'principles of finance pdf download', are likely lures to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://nbcmedia.vn/ckfinder/userfiles/files/sezuloguwejofoxiw.pdf In PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/kaxatikadowalolop.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/wokozokodebuwejegu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16091c51cb1446---vigewowalifigagiz.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lukawesilesije.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/maxitejodixosapi.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kusikapofake.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/849904772.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7775eb41---bololifago.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/titanojewojigizukunime.pdfIn PDF document text
    • https://andrejc.si/files/file/62195305870.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e161e81cb627d12a21a83e9792e2ed13/48347599000.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/27573183361.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba407fd76a2---mogagologusupokiraxos.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/vobagigodatoz.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/4289617805.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/54025793182.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/50983445667.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/70999818909.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/598988101db454baec5bc8a2b3219c8c/kasegukokowowapix.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/epoovj5kqkeptiqe5a4hkm9vv5/14350959196.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/mitaponekavuxigu.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/75608733565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=principles+of+finance+pdf+downloadPDF 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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 10604 bytes
SHA-256: a2793db67bfcec73346ce73929ac062e53eb6cadae378a44bcbf88d995414f7e
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 16844 bytes
SHA-256: ff9f5d45996f8c57fc350bdf9e69c807a7672d46c0d5b7ddca446282483b64e4

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