Malicious PDF — malware analysis report

Static analysis result for SHA-256 c962117697ad1e78…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 01:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4603ebd7becc75ecc0f358a07a63523 SHA-1: dd6e7062545fa48f0e69e0c159d8a17813a86a17 SHA-256: c962117697ad1e78c83c63fd6c4da32de5084cf3e32e2a09d6f7255930e0d588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=wizards+of+waverly+place+trivia+questions+and+answers
    • https://deltagroup.bg/uploads/file/62222228205.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e37e02cf---80166207744.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/94tpkln65piauleckq7oei23pv/mutirutexazilisenerego.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0997c2cff---12508663754.pdf
    • http://cerrutistudio.eu/userfiles/files/17262263928.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ed738811---6513461991.pdf
    • https://t2sc.me/userfiles/valunelunebamigag.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607581a25f168---vaxuvafoxagobuxusedil.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9bbbb79d---xewinepodasirotadepod.pdf
    • http://domeinbeverdonk.be/assets/files/file/43001671693.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8159647e---dupuxej.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8cb3d26022822ef2ce6ee4ebe796242e/rikitufexakafawivagavig.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7o96nkrrcjqplhvn4ubdo447gi/xazalinojam.pdf
    • https://amitadevnani.com/userfiles/file/gupeloditej.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5eia421hjru3t7q6v6rp1q7gdj/14196224289.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/22521521140.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/05d5d8d7187227eb7c3030b20345a4c9/rofakizawi.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/c9fiig1olbp4rl9afrpjhcmjqs/lejixaxezasalagewixedo.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/aaaa9bd0f9e3a25336ba96c667acf1c4/digemaruwuvivi.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s5c9jnco6bj4m8s21d39eta5m2/94106726956.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8f8dff1f9a916b8ffdf764b72ea0f59d/mikuse.pdf
    • http://bookblog.kr/data/file//files/69433653255.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bb.bin
658257a3ee253d7595f6b3a449d37f041c7203ab9f2c6b12b6672c0a310649ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 11180 bytes
font_01_sfnt_off00010bec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 16792 bytes
font_02_sfnt_off000123fe.bin
95dfe886fa09d2839d55130a801298abd5c02aea9e66cca264767e433f2240be
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 17712 bytes