Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84daf79c8925a77…

MALICIOUS

PDF

90.2 KB Created: 2021-09-11 07:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf400b31be5e2b17fea5ff22df23bbe5 SHA-1: 7ba915591d0261c960ce02c509bbd98f990d7e79 SHA-256: c84daf79c8925a77d1926f813966ebb48e502ef7eb570b17b612758d0e6d2482
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138da2f8d0a1---xesotemodelepafutunid.pdf In PDF document text
    • http://sowiik.pl/userfiles/file/69302535284.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/77317298855.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161308cf15e17b---xanena.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bamegadekurejor.pdfIn PDF document text
    • http://vinmexindia.com/uploads/1663473655.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/xipuvumadusum.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/newalofogisujomuve.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a44454646---binirazodagipogoxo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/tajikuwixowesuwalit.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/wisekatekoxitifakalaxota.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xatesaju.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/54646310770.pdfIn PDF document text
    • http://emannsltd.com/userfiles/benasekokewekuzukojobotov.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/zudisilitaximi.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/jedulevekoxikepuxof.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sisinafanakix.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/15705707385.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2ec1783f---dajirugoridogivel.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210902115339.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49776697371.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051048015739.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/61467602596.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/16590832542.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522341edc4---gotoz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/99285524066.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/domopasug.pdfIn PDF document text
    • https://spacio.hk/attachment/file/51626882627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=babumoshai+bandookbaaz+full+movie+watch+onlinePDF 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_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 17596 bytes
SHA-256: 95cfc001d3aec202b3382027a4d81b9ac98199fdf80d489a415ab5d514584a50
font_01_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 11240 bytes
SHA-256: a74fbb194f2d09f031a4a97ba7a8e4c1610914c5287040dd9137079eddb2fc55

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