Malicious PDF — malware analysis report

Static analysis result for SHA-256 f113791e69ed383a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 01:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 244434216774a8326a4fde8e869a6e5c SHA-1: 745d9845a15568fdc507b6497681e52e44a7ba6d SHA-256: f113791e69ed383ac0c63a1ac225f04dddb1f633adcedac1ee655ba889e7d9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple PDF link farm heuristics and numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggests a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://1night2day.com/UserFiles/file/rifatudow.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16113aac7a9972---tukorekokug.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081b011ca4d8---neroj.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/vobetelemogukizuvegisos.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d46f8e3a5---nidamizafujope.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fbe9e4a5497879a8b92c65d48167e637/65901323260.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/meweparojifivo.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/94788306178.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/rulamovi.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/betus.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/padefofavubakegetetejezi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nf14mlofseio17lsh7ctmr8uh8/sewubumalaxakobafebu.pdfIn PDF document text
    • https://atrax.hr/files/zubibusaloto.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/jogax.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/begoborilevusinav.pdfIn PDF document text
    • http://dnepropress.net/files/file/nawazavakorogiz.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9dbb1a5d6---dagasa.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/19193109934.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/781899d429519b9f2b7c6238567db812/tezekezexedifezu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c0e4787c81e462dc44fe0fb05732856b/mazamanolixumujex.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/50580363692.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/62315480316.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/km6m05tgbns0uau7cgmfd0f79u/gukal.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74fd39a8b---tuxizirivikifafesivobew.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mukaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=british+english+grammar+by+ak+singh+pdfPDF 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_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 11224 bytes
SHA-256: 2f646e0fde9f89c995a88177bf2f25f0a2db59a40f36c89ea4ab86253b5b1651
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 20140 bytes
SHA-256: 43588f4a0387feae300ee52517c04257e707419f017d54f402d5b50b29035b9c

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