Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed1c224916b603c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 10:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cff7de7d5c8a9c58290bc24003c40d00 SHA-1: 985aaf85a41cac3226f5f2950a869c10b21a8f0c SHA-256: 9ed1c224916b603c038015d5ae20bd35502f2ee5550e501e40402101d0173d7b
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a QR code lure heuristic further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=javascript+generate+qr+code+image PDF link annotation
    • http://dautuck.com/uploads/userfiles/file/xakebikawokunefimimi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/lulupovetixuwakarik.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/65364468908.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/99413640458.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/2579244213.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/38267374638.pdfIn PDF document text
    • http://www.polni.si/Images/files/jijakepasin.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/76920373368.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/64005299155.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/2602291249.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76467229497.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/63466727069.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vigeg.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109060347064866.pdfIn PDF document text
    • http://klenderbio.com/upload/files/98121589080.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/40625948715.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/fatibuki.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdunu73m8e9ol3rfk6ck9ijbk1/16021926581.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5f21a326---dumizu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/38062904406.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d53b2b1ac81f0ec61dd98fad3dcb04b5/perugodetajuvakutifijen.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af59441c3a---28343097011.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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 17372 bytes
SHA-256: de4a3c6754881585e1e82fb303c5f84f37bd14d7be98db9ce0e06fa6ce1864f7
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 11016 bytes
SHA-256: 4f4a0213632ecaaf5adab3973d3fd12b78a03b20895fcfe5fa4c1451fba062b8

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