Malicious PDF — malware analysis report

Static analysis result for SHA-256 da884a08cf5f0acc…

MALICIOUS

PDF

98.3 KB Created: 2021-09-05 22:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bebb79bfb91ba8cb657c8801a547de2 SHA-1: 932bf4ae716dfc3ba93ea089f06515200154ac2b SHA-256: da884a08cf5f0accc13f7210b3c666abff511734beeaa840e9dd19209e790a9c
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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://philabc.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D8%AC+pdf+%D8%B9%D8%B1%D8%A8%D9%8A+%D9%88%D9%8A%D9%86%D8%AF%D9%88%D8%B2+8 PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lhepff9sc8rof6iqqsf563abu2/78269319532.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed987e69a8---gonilesufumosiwiwufili.pdfIn PDF document text
    • https://tekmaker.com/upload/files/rowiboleropenofixeko.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/regiwuduken.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcbcddabe---medavidufe.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/k2gu1sut3tucpsh5q15mb472ok/tajugixapipoketa.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/73196371414.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e9cc7c57---83417776530.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/76867974427.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ffaf131f365a13b454729c335c974ccd/wejesamalemesitajubabud.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44475596087.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tikosadujezuwebamimot.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8oc29g021c9ckdp4gogn055b2f/45982926542.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/gizibedotaxitilunerojif.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/95860198940.pdfIn PDF document text
    • https://alpinashop.bg/files/jufumozijivef.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tunobo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/tizalumozatesufodukubene.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/74421366800.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b8130aa0aa7531a255ecc984a318ec25/63239073589.pdfIn PDF document text
    • https://aneri12.eu/res/file/64743572918.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4e6bb4f9---ketid.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b70db83f---fuwosejimumafopum.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6448753---xifijiv.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qc6r7vkscsnadk857asdosfep9/45636834823.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/59329739878.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
stream_005_off0001349c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1349C 26104 bytes
SHA-256: 52cddb3ceb4afbeef70a840284ae0e1708bdf6eb8d545e0525abb12e123ab31e
font_00_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 18844 bytes
SHA-256: 603549472e1ec4c211ae45a929d3cac850796713d14adc4a0f7f3660e7f13cae
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 20648 bytes
SHA-256: 47cbf2ac4e023bfc699025bce4191aa8372ea95e66d64940fc1d9394e9370298
font_03_sfnt_off00016334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16334 9580 bytes
SHA-256: ed10009cffb1d6dfff6fe042faec6695cf8f949d8126d946004916977b5ba443

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