Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f35d0f5d42675d…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d63cebcc8d883914d51193b6e98c0e1d SHA-1: a2ee4f6134227a344550f787bde6dbcbf9e4bfd8 SHA-256: a1f35d0f5d42675d9fa833f2bc2be7a22e6da5f491a0b66fd516cfc81cab5756
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825068d53a---fomadixomawem.pdf In PDF document text
    • https://faresaldabbous.com/uploads/files/samoromavegarozeji.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/gajewexusujaxaxegixipifu.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/bizemod.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/57464780488.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/motewujuvixaz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421ede50caf---dofogimilitenu.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/jowotavawusulerit.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dorojokinufoseze.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/33974675069.pdfIn PDF document text
    • http://actinq.nl/upload/file/58529612091.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/84853294576.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/59374885568.pdfIn PDF document text
    • http://jainfarms.com/uploads/33611948905.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/32829975961.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210918185113.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/jikovegivofo.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_181341.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/naxarix.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/43293197059.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/80807022755.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3trmo9abu30m8bi64hgjbc9c5v/mikal.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece3255c8f---gesojakalukenomogojulap.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402bfa86e48---36012134826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stream+mulan+1998PDF 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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10492 bytes
SHA-256: 80d7c7ea5c1abecb5fc9b7b74f1e4bb4c64afff99269517e7c5a24e989252eba
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 18152 bytes
SHA-256: 8b10289d3fa5340e5c0e15314a283a9f71b83ee6a4a48e9231d95d07b85736e0
font_02_sfnt_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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