Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8800555d2637ff8…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 05:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6934a976c956c5f0492696b7d7c733c SHA-1: 8ab094ff10221e987c47876512fba2f50d5eedb9 SHA-256: e8800555d2637ff8ddf621b00bb71e935d251af83eee63a68eac1e0da59d0d8b
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6f83d98fe8e39b3843fa201d8dd10ca0/monewuputibepenedetanumes.pdf
    • http://szolnokepul.hu/userfiles/file/90239473686.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/903d01ff67c1d007027269f056c66e24/kowelirifad.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbf17ae2d---doxilipixejalugadojavo.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/gofokomijigepupamu.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065304a44b---sorajamililikopedoj.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1f01680c296b6583307ea14d43097494/xawawitizaturikegaki.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/553466702.pdf
    • https://alnahamgroup.com/userfiles/file/sedufi.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/64046447885.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9cbed55fc72a8417bbaf5b6caeda132a/wuwela.pdf
    • http://drivingschool-brno.eu/files/24617541919.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3af15888694c034afe1d52cfa3ecad54/vudovalanovulitevaz.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qav488ae5l9h33e08bjqkgftrc/85989991769.pdf
    • http://nfrostov.ru/upload/files/78533779014.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072990993b71---nanosofetumagekalopu.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/susuxob.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa1038bed---wutexutumexuvatuxed.pdf
    • http://www.companyforte.com/imagenes/editor/file/20490268706.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f472eb6f---mufono.pdf
    • http://bi-acaovo.com/upload/files/rakige.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/10ad573b6d6bea05109b40047fd49daf/14635773853.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886270835d5---busuganofokinufibugapagi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=job+19+commentary
    • 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_off00010994.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
font_01_sfnt_off000121a6.bin
2705c125da0ba3a22084ca04eeb6948467985e1223700238fb7611fee5facc50
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 17560 bytes
font_02_sfnt_off00014f41.bin
4d3ddeeca00e78381558e18ed43c1cde38d4bc304242e2e02bd62a11c7ce7c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 10548 bytes