Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8cbb7df25e8fb6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 06:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a70d1ee52e1869c0586c26f8fad3818f SHA-1: f11a44cc89735059117405ea5f2a72c8f087c533 SHA-256: 2a8cbb7df25e8fb658f6d901cbadd7442a726404d27046f91edb31fbbc70200c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/gamutudabaposemoxorosoz.pdf In PDF document text
    • https://arerp.kr/data/file///8560638527.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65bdc21783---nuxogegijowi.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tuledulufidugexolore.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609835159fee9---runugewarurejizejuzo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210726064335.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4fc5bbad76dd4385da37252dee339a/jokezimofe.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/34517437567.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092731381c19---beketitivafud.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/33318371877.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/91161739829.pdfIn PDF document text
    • https://csn-alliance.com/data/files/fokinadifodaxoxizux.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/85598390305.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/xerusavanevidujugo.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/vodosamuvoje.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/93594053778.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a4302b4541cb8a8a936e6d98cf1a18fb/85480125316.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/35tci23m1lk5f1q111gemdjfu2/tudowedubik.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c88165ce3c4---42866179504.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613032b8d034b---nesinoxevezewe.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/3519508973.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/17154439290.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7t25k4it5qn4rjvd1ua2mh5rvf/jaxivesadar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160dc83cf218cd---ritedemevijonula.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d9fbea8a---zomulorugedaralimu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099caa9b217d---xeziniwisefakukarofiliwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=automobile+engineering+books+in+bengali+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_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 17668 bytes
SHA-256: 19b1c96539dcfe8ad814cb9389d1dff418383f9129cb70ea87a0ab13a78ea23d
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 11156 bytes
SHA-256: 95be86ac159a16ac916c40890f1cfb0efeea60821942843079b8d78c5186d390
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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