Malicious PDF — malware analysis report

Static analysis result for SHA-256 44423a2f6f4e08ce…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 16:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbfd33e666c6ee192df062f1fb19f358 SHA-1: d6bb69a283524a5de0927d7dbc0871259781100c SHA-256: 44423a2f6f4e08cec0a0218ba0e020c13d57613c2993f57fb9f5108ac34da48e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=omegle+video+android+app PDF link annotation
    • https://kaptenhoki.net/contents/files/xidesidulofozokutobabavor.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/30576528494.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142da1aec01c---detaveseneparimotoju.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65035026266.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/bigogivetijinad.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75477960000.pdfIn PDF document text
    • http://jljemc.com/upload/files/gapilojepuwo.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11890291560.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/nubezavotimune.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/94216525019.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/fizuwen.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/kakebag.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/10901158867.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/ketulovizuwex.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/50368772269.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/56611377919.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/faburomukig.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133534b31201---82314352036.pdfIn PDF document text
    • http://saimiri.name/upload/file/boxupebozuxajeroma.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161300b2760881---patijijojufe.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/11457563576.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fokunirenupeduwolazo.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133037be10ae---8316947284.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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 10560 bytes
SHA-256: 25048d165998772c283d44cd612fdbf7ebcc8c8d61f46d576354319e991d147b
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 19852 bytes
SHA-256: 38441ed467880cb29388cf670748309eb4195c64f057af034304b36bbe8dc959
font_02_sfnt_off0001337f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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