Malicious PDF — malware analysis report

Static analysis result for SHA-256 64af4a3b07491c9a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-30 21:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e477e6d4690e2f8ab2eede72c4d11c79 SHA-1: a67473e2e25688dee0ab1fdba15bb2e3e4642960 SHA-256: 64af4a3b07491c9a589f7f1a7d9e6fdac629b4c8a8e562e0a75cb6bb9c8b01f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=how+to+use+an+angle+measure
    • http://tamphuhiep.com/Images_upload/files/26200482968.pdf
    • http://ahlhy.com/uploads/file/021836223233.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075b02d8d182---mepunifawuwovabojokador.pdf
    • http://bogelaipigeon.com/upload/file/dadiximabiduxobiwasivodox.pdf
    • http://ecoaga.com/documentos/file/18810958372.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/7815436997.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7b477e72---34454594785.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb89f811ff---81422036319.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fea3f3a994b---sovakobikiwuzugolin.pdf
    • https://fetogram.ir/images/upload/files/boxurexomujekenanet.pdf
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/36990180325.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4773c6e2---jolufipisawi.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/bidabulabalumokirezenaxil.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xifop.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102da453e083---55035288787.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e4fb45c42---77119160729.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vukoduxinetes.pdf
    • https://33mobility.net/uploads/files/85184901580.pdf
    • https://wickedcheesy.com/images/file/visupogepidajijijejis.pdf
    • http://go-pxl.com/uploads/files/dijubipolasuj.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/86338a735acf009511b21ed15c65b63d/pefoxetajenepixisokixev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1eb.bin
bdb73229d21651297abf7242cf9d84faa183359911119564d93c7f222cbdb6ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 17648 bytes
font_01_sfnt_off00012018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
font_02_sfnt_off0001382f.bin
c4750c342705f836a5b3f6ec4c8d3343b85ca5ab4b7ad38538def204f400c8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 10536 bytes