Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbff5188f425a149…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 07:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b3d650be0fcbe2fb95bae9fefd73007 SHA-1: 3883466895bcb7d8f75034ddcb8b4e33b41e73dd SHA-256: dbff5188f425a1495fa2341ac367b4e62cfc40cc3f52b9fadcdebc0ce9cf9a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://izeninfo.net/admin/upload/files/biriwopojeruteriwek.pdf
    • http://wooshin.kr/uploaded/file/24549748260ac23d40f664.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/df9cf5cabf80a2a308b451dfb2ddd50b/53178131458.pdf
    • http://casier-a-bouteilles.fr/file/motitodojes.pdf
    • http://belst.by/upload/file/lisofifoveguretunoke.pdf
    • https://jurad.eu/files/file/97992196322.pdf
    • https://motelandratecuci.ro/userfiles/file/pipilavivedalidowuwora.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee19e0c2b3f---bikukuva.pdf
    • https://walkandsmile.com/userfiles/file/30783675427.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/zijobotaxopawepubetu.pdf
    • https://doosradashak.in/ci/userfiles/files/linexetuzexusup.pdf
    • https://vinadesigndanang.vn/uploads/image/files/jafetupazelonevapubim.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/zetuledidolibafuxosa.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ed7e2f954185c292c028c1c4dbe7abc6/32085127566.pdf
    • http://qytbearing.com/upfile/file/rosegewebogonofofikij.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ibuols5q8dh96cl5f7ipuh2b9/domomogejuvubefofajij.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fe0c5bc95605154d7bcf0ac7e2736f7e/tepalawapen.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0e48d17812bd6979cc69278ed205bfa6/finilejamemet.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfc9e5bbf---71054503225.pdf
    • http://studiotecniconuti.it/userfiles/files/67329346435.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d2a3b7ab---58588416594.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/vegorobonirefunozobupoxo.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89f81c12---wisimepedilujogovafug.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b3253355---23346542177.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2pd2c4k60ciroekoa8me01r3sc/37210318353.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=exchange+server+2010+interview+questions+and+answers+pdf+download
    • 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_off0000e06f.bin
fde42aa787c53b1deb67c4b62f4f314646e82d81c290d245905c1e9f65bc0d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 11676 bytes
font_01_sfnt_off0000fbd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
font_02_sfnt_off000113e8.bin
bd65c52fd6e135d7ff2fa26293178fcd974e660329abea7eecbf3c5986ed4e72
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 18012 bytes