Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bdd133c070d239…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 06:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a01cfdbeb69e9a8bf689fcf5b603a00d SHA-1: f533cc313d30627b7b0b55744e2da6c28a8b868c SHA-256: 78bdd133c070d239a50894827ddc4fddcfd48fbc191be6869b81a8f2c7dcadbc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm designed to host malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=18+aud+to+usd PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1dda6a82---rebinosumamavuwe.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/54328228615.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/bizenenixudojigijutak.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611418f727f66---lenitidetuguwik.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/xagakikotas.pdfIn PDF document text
    • https://motiv8workout.com/up/files/wudamomil.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/nelakurosupetomomerib.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2f4467ad---vamagabajepotad.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/88081513368.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/duser.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8c342ca18e0078554a6a4ffc469f6ec8/67641933141.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/pafinezulobutawizawedi.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/59764692632.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0nvl0edhrsa35pebqb9vll7q5p/satozemipo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b7c4ea35bed5571dd6b4461a5b8c4e8a/kejipipekoxuso.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/61004082221.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lleef12g3uhcooqe8htg4r1cs6/82636721988.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e5ac571a---wilodibirapuduliwodedap.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dba85c629---35215158476.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d8095c1---60233349533.pdfIn PDF document text
    • https://questyme.com/userfiles/file/14466602399.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/6834453205.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc45cffc7---47299244888.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/kipav.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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10032 bytes
SHA-256: ceee17b03e1600a3343170617b714bdd1fdfb7ab4dc7a1049be0458727b75875
font_02_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 18984 bytes
SHA-256: b7c65fbd8575bf6cd6be94f48a9f616437d6ae6fd8cca10ae523a6415189bfae

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