Malicious PDF — malware analysis report

Static analysis result for SHA-256 4537a929c972606e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 03:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 363b29c65be19a80992db13ddb1c1683 SHA-1: 4eadfb9c53a832c0db0f890a81251bbfbcb6eaf5 SHA-256: 4537a929c972606ed10e10fd82fb84782fa2578a45dbd232eb82a8de5fb77e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=ski+type+1+2+3 PDF link annotation
    • http://www.pratikchoudhury.com/fckimages/file/detasufabobibumuxujewoj.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/60886325966.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xikesobavugawalopetoxiku.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614095cd67cdf---97212254102.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/5938040954.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/guriketitupifog.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/60822719705.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/76372027480.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/93197748673.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3b45548ea8037db6dbd6ba8714921a91/duroridikeb.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/69774052625.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/99157659731.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/44982385801.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ded06910e0---zuxawugusujamefoxotamuleg.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/barujidirizuxufux.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/66070065587.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161502b55d21c3---moxikamad.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/58386020507.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/83185437524.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/modafir.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/25590735562.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kelisavidapevusedajizekit.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e7a8ea74b---2428848383.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/rakosigajavoninemin.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59777587571.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_off0000b21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21F 10172 bytes
SHA-256: 0449615baa5cd3f814652a25fc7eceedca46f44a64cf5590764131c3679c7664
font_01_sfnt_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 16388 bytes
SHA-256: 4850e17ae06115d9f9f4063213505ef41adfea16e95423a9849f43b8f3b9e1c9
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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