Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd1c93b26c26d2…

MALICIOUS

PDF

75.1 KB Created: 2021-08-30 18:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 604adfd49148beda5cfe03386205819a SHA-1: 221e8ba11cf71494730f9e005328497f7325cbdd SHA-256: 3dcd1c93b26c26d2d2d48a11d19bbc2d2bb1bcec86202642d04871209abf4c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous URLs hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an intent to lure users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bcb0b23e539a5922e1e926c2fe31ed12/vosuxerurupojozijub.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a77e9af---wevalozepabapibel.pdf
    • https://burgaseguros.com/userfiles/file/zezixijoribonu.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804d332dacc---31087847048.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2309a73a3---fuxibuwejunaper.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085559d8243b---fuxugojexarodavo.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jopida.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/674s490l3orlkklmaf0c8hske8/88662203227.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bfaee9e03955d3a74205a0078f7709cf/nufoboduduxedovidiwexe.pdf
    • http://karunb.com/UpLoads/files/povuk.pdf
    • https://daismene.it/file/puzodezatipenaxepirevit.pdf
    • http://lakes77.com/clients/47041/File/wosisawazituboxa.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/80bca823ba5a9bd1eec297d4e9a89e1b/litutapivedesizes.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a9fe5070---letunupebo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc440107acc---75561341919.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/m9oklbv55f9ih3f3dfu26rnm20/gorogupapiwuboketoladibom.pdf
    • https://hearing-outlet.com/uploads/files/202108300524297791.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608952506d0ad---sodikezigetomipebex.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gasimonin.pdf
    • https://supermovi.com/userfiles/files/51642157307.pdf
    • http://pol2-simf.ru/userfiles/file/21300015758.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210710_1B8C510A475BD7BF.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+achieve+your+dreams+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_off0000c284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 16792 bytes
font_01_sfnt_off0000da9b.bin
4e2ef8f0fe7d5dd19f6719710b64b5762ecc711c333ea584e0ab81d107fc0414
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11092 bytes
font_02_sfnt_off0000f48b.bin
078a872f5f66506d0e2baefc85c2f27da5762f9f8cbc55bda07eba20062ffdc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 16264 bytes