Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a54611a0a6cf60b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 18:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f10feb592bde201b05982f0b82191909 SHA-1: c9ff0edda9444a17f90c692794cd853db34a7aa5 SHA-256: 3a54611a0a6cf60bbfdcd92eea03fb0c390083ff0e7fc1771f3a415dd16ab1dd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://urotunisia.com/uploads/FCK_files/file/9171697084.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9ni188sbg6gdh4s07d2b2ec6u3/9013785580.pdfIn PDF document text
    • http://chinalabware.ru/d/files/3301689563.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607674ba93c67---disinuzojumuvepevodaf.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/patesadewonigowomix.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/nuvitofapefefafebekakun.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/28913914983.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/31766844804.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a17bc5d5ce---23670348126.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/jelepubutik.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16108ca497c609---gosokiwotexakarakalulali.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe92d903006---julezowagagikejin.pdfIn PDF document text
    • http://stonebreaker.at/zirilazivafodonupep.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/53638530227.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/bemuminosapegavuvoveza.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/599e58a8ed2ca99949254f212d095a23/16184798713.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/72429012270.pdfIn PDF document text
    • http://ccadl.com/files/20210728093124.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/daxorefuvewetofubigo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d18faef06---solomuwovizatewul.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/vimuzuzotoduti.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/j6ni4cf8kg1ethtj65dln33bl5/xijibilajenuzevukitelu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/61642441243.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955644fefd---12564034518.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/efea660136a6e11583432f45413659e5/29027573039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=currency+trading+for+dummies+2nd+edition+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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 18536 bytes
SHA-256: 2a4a5ade14c8043aaeaadd1a597879b18d1c5a8ec908f26dde9e55a34bfc2229
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 11284 bytes
SHA-256: 31023690464cf49356528fe6c09d9624c80ab6efe74e7c3ff9b102079610cf05
font_02_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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