Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d453fc9773f8f1…

MALICIOUS

PDF

94.7 KB Created: 2021-06-26 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d9e79b0162fe6b23b6684a37c91e1ddd SHA-1: ad34a7237c382242c82c2c98c84e4c313fbf06fa SHA-256: f1d453fc9773f8f1c6739a6719ad4a0ea4d4badc06987a0b760f69839be092bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://synerhu.ru/uplcv?utm_term=access+compact+and+repair+not+working PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d9c1325fe7b7a1be031e7dd3f61fd2f7/91937142527.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/36112905152.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/demifemamavivuv.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160922029815f8---sapoloziwupudugazo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6j5ub60rf7osudf0378t27bphb/raguwaw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5c1e45858978b8125d72ef723dfbd55a/bubiwigebewukikomabas.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9baa9dca71---25626818529.pdfIn PDF document text
    • https://area5srl.it/file/gazojasiguramuvudu.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/keturoxikaxitubivob.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609076261c80f---79834417792.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d067452caef---66980532813.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/99667a357a748e22c9bd72654779c8e2/33061656037.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4731e0e0---77589004354.pdfIn PDF document text
    • https://caffedisanto.it/file/datupuz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607b37cd84f0b---43551673874.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jowufimem.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ano9ud16lkuf7mj67goik57hba/lowejamarumifiposat.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/nugodalapazabige.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/foludobiguk.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/laxirupikataki.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cfc093ace9b4f1cd13ff2ea49187b592/waxuzezijatagijaminatev.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/83645768766.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/98696917740.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/16956401240.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/43pdvggj39p1tuk1731dcj2pv8/pirukonadog.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/5352302387.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10972 bytes
SHA-256: 9a49f83df35a24aa657ce63204375500a0943bc249e6d3476c588420dd9c5010
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 17296 bytes
SHA-256: 289efcb1ceffcce5efcc9ffcb665a622d1885c23c033a5638ff4e1efef47fb0a
font_03_sfnt_off000152da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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