Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fe2d51168dea7e…

MALICIOUS

PDF

483.4 KB Created: 2021-06-30 11:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46800eff4ff1dfdc35c9f6dfc75fc5b8 SHA-1: ac58bdcc52ad1a7827b16a4c75afa5a26dbe1690 SHA-256: a7fe2d51168dea7ec908a12e6913060973835f0bafe296428ccc4b7aaafabe2f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a lure to download further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of external URIs and compromised CMS uploads strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8342

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=meaning+of+indo+european
    • http://kondicionery-ivanteevka.ru/upload_picture/file/9735142125.pdf
    • https://digitaldaya.com/imagenes/file/xepapomobuxemedujupuza.pdf
    • http://ajtoablakcentrum.com/_user/file/guxolafirosom.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91ef1e0b1---vibeber.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/20905476505.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d4bd32041aec006646425fc734aa5fe/xomiredafaromipolowalogu.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fsjo7k7nm72f6312ot0s5ld2a7/fizal.pdf
    • http://msamerica.net/clients/873634/File/ditonejomobuba.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf25c657a---lekopekapiposu.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/236234447ecaf9f923e919434039990d/gokigudogireduvus.pdf
    • http://afgventuregroup.com/cfiles/file/76862237961.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c212ecc1fe2---53258778032.pdf
    • https://sayurhijau.com/contents//files/13572960271.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4u9nngue9mm1hbspkmki3tal75/putin.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/buvutopoverikemekogeb.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c76de2d19ec---nexozabewufebatefepema.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/36c801e69b14a34433f71fe9831b347c/kilopami.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7124943f---riwonexunadajivaz.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977f973d57---mifazusozoto.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ee64532297c2bb33dacfb4e5c6dee37d/19765083050.pdf
    • http://dmhu.eu/uploads/uplib/file/29909501429.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8e46bd6eb---wipigoju.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6570f74b28ea87721f4c1e5bfcac7287/zodixoza.pdf
    • http://humanitool.ru/userfiles/file/76850246466.pdf
    • http://begemot-rus.com/uploadfiles/file/2021063000230773499.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fdb312eae---79962946546.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_off000714eb.bin
fcc6afbcd7ee1f945324ba969c43c84ee3e985a646b0ab1dd0533b1921cc5dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x714EB 10456 bytes
font_01_sfnt_off00072c78.bin
d2e9f8ef86629f3a1a71d84d95ab774afa8962f9c87d0e0f5805dd12f8d5ca39
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C78 25840 bytes
font_02_sfnt_off000765df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x765DF 16792 bytes