Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a549306e92895bd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 17:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 622af1e26df6a61744a8b8f5ed594559 SHA-1: 2048499568654f50182e4fef0b32589ebc53afed SHA-256: 6a549306e92895bd8edcc101850a2223d763716be377464df6e846caca8c432a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external links and the nature of the heuristics suggest this file is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d42a14a---4219100580.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/bovozepekunafivikibapi.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/jopimemepanoxef.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/25017920265.pdfIn PDF document text
    • http://yepuco.com/uploads/files/87656047181.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sabogakonajuvejodebu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613735b11b7ee---logikitev.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909013509.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090306095373499.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/jirelozivilaforifez.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kojul.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/25575358826.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79710624818.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/53234073177.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/binoginubotoxi.pdfIn PDF document text
    • http://pileki.com/imgup/file/85223358289.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pifapukizanogirunemum.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981186a2---zejuzizupu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905013041.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/wetuvidatetuzapux.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/98622720836.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/8731039136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+can+you+do+with+sea+pickles+in+minecraftPDF 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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 17952 bytes
SHA-256: 264fc9a51fc6dfd4b222f574e65d2acac686fbed12ad186ec7880dbb49fe39cd
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 11272 bytes
SHA-256: 19badab6ef5b91d9b2e3abab44e194bd08806a28335de9340c6c811d7756fa97
font_02_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1