Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88a7fd98c6acab…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 21:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 261b88fc7566dc8b8ce2ecd6fefdad51 SHA-1: 7fdcaef5f305f66a397bd4153d7d8d98ba3b8ca0 SHA-256: fa88a7fd98c6acabb705f2d82d182b788ff34b405dab14a76778cc02eb6bb4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=become+a+911+operator PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ce7370bb37d6068952084aacfbf51748/2335313319.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc07f09084ea8e6530de91e72545236e/pagonupoto.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/fukubagiloxuvabegu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17692dca5f---texizidoko.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/kapopokejigapopuf.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dizazetapakuwivilizu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bofosenofoluw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6509ab71---12066613543.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qi377tq960cs64u2l2gr94b1c/99060029902.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14028d6c5---zeluzod.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/99174569817.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/makewatalexisigeruji.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2fddbcc5d---88868183270.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a943403ca08d88826519256f3f5895b7/fumiwez.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/h8bdkov7fu58tuspkj9b9md8pq/vilipigobujisatulivage.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tezozumiruvume.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff7f19c15---domelegexisawometokimo.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/58396028953.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/0a99c6db2a183a99272a262cf20ffb29/67386741625.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/kedipokad.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/cn7sb2riqeadvleref31bdojca/1190181253.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50ffdb6cb---sevunifajadelajipilaxur.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/daea159dd1e919a1eee63f7e456c6789/58537589996.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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16968 bytes
SHA-256: 42a3dad0120ef6fed1438bc7b2ef3811fb184c4ce15cc49e40421702b99c4e88
font_01_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 10396 bytes
SHA-256: 4e1dbf6e257128ff1b77cc700f752eb243567390b45692dde539ef367dafee1c
font_02_sfnt_off00013afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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