Malicious PDF — malware analysis report

Static analysis result for SHA-256 d536a632c2e3b5db…

MALICIOUS

PDF

83.1 KB Created: 2021-07-06 15:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc84934cb280ca09364269d3a3363e09 SHA-1: 0120db852130242feb821238255cd5e4bc3274f9 SHA-256: d536a632c2e3b5dbf1a32c2764ce1936bfb6674f726f60de1f9082beb14fae8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm detection strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160982f253704a---76089481509.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a523971ce77---judizilunorisar.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf1166c48---pekowojexag.pdf
    • http://alibabashipping.com/userfiles/file/vizefesifojivoxaruw.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lbgbmragmr4dpl1bjb39fntb30/komujilubetemiwiwetukusil.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/32154916475.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dc21996c---80399328199.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/mapisokutofexedoruxefa.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/91543273115.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608721b559feb---18684436694.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64672a3cd---82319157044.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084fef053da1---20973750479.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a303497e4fb8e54b0b5c744cd3fb0ad0/17803662171.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/926qqu05jhs0lquq56cmvdf3e1/8002685297.pdf
    • http://bogelaipigeon.com/upload/file/dapafaganulaxiposase.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fcf620b8---81961809171.pdf
    • http://allaboutdowney.com/userimages/10277290405.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6116570cc4---pawijojowadefivun.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160743f459e912---gagovaralawijibaganus.pdf
    • http://sbnjl.com/userfiles/files/16374553311.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c26639ba---dalujafative.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7665a0e6---39484893977.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/dhm2k78ehduu1vfmj01sldngo7/31957089632.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1555c06e07253ad16548f58738c33ad7/nisuwisogavapo.pdf
    • http://lapenya.cat/imgjovesnaves/file/78812732914.pdf
    • http://prinsart.ro/uploads/files/28536195330.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+a+pdf+to+word
    • 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_off0000e27e.bin
952c34c8821337f520537ba2c7281a8b17657e2b33b39d45695df18ceaa9e14e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 17172 bytes
font_01_sfnt_off00010f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes
font_02_sfnt_off000127a4.bin
f71fc09c87f68578e3131eedf349b9797608e3ae64c901860055b05395f41fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 10404 bytes