Malicious PDF — malware analysis report

Static analysis result for SHA-256 be36c908af16c75f…

MALICIOUS

PDF

88.6 KB Created: 2021-08-11 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a747f7c0c884186b1766a2242c7f8846 SHA-1: ab1f43fbbb0d713d1133707daa9e00a0d6a98f6b SHA-256: be36c908af16c75f668221fbcdc359c4ae12ae053b9cc93a2916c1bec2327c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=grade+5+fsa+mathematics+practice+test+answer+key
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2619017bf73709fa9654e05c97f3c6c9/xivikedokekovan.pdf
    • http://zxsolar.com/d/files/27665355300.pdf
    • http://jiab.net/userData/board/file/5642414129.pdf
    • http://casaatlantida.com/userfiles/file///41403469305.pdf
    • https://tamphuctriland.vn/upload/files/rinitogutizororakupima.pdf
    • http://smn68.com/clients/75339/File/bikufed.pdf
    • http://ginzaoakland.com/uploads/files/migurinogugalogesanejir.pdf
    • https://cooperspick.com/files/70943096718.pdf
    • http://cnpair.com/userfiles/file/83075028991.pdf
    • https://sfeerweter.nl/userfiles/files/tovatasuregidugad.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27b705e98---gofote.pdf
    • https://drivetripper.com/userfiles2020/files/69562814706.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39b0992fa---61274396816.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ee49dbc5---ladaf.pdf
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/zoperevizadesojusuf.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdf
    • http://rococosofa.com/files/files/xuxuvatebumowozaj.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075814645102---19798237687.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66b48a0cc---68286626686.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/67167588156.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c2jo1q8nalv8hv6cdoq8duo0l4/nonuzaxaredebilagogujur.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/aaa4f402b4d89fe86c12aefa7980e37c/89704464996.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_off0000f285.bin
79596d6e6fca7504b9026647a4b643d744b953571bab6d16a6b5b3ee1ffd396d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 17952 bytes
font_01_sfnt_off00012194.bin
a2cb8130858a8c5755029c939f49de1cb96a39d1119ebecaf68075b82db83154
pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 11184 bytes
font_02_sfnt_off00013bb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 16792 bytes