Malicious PDF — malware analysis report

Static analysis result for SHA-256 10023ee98d034a3f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 03:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9be8d5cabdc1c60ae7af534963b9111 SHA-1: 82b0c0b821ba5daa4b863968d2533272a26bf6a3 SHA-256: 10023ee98d034a3f8dbdba1a3c0a4a6ab292de31b79612de5e9524edcf132b68
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c9b6468d---dakimoruzukupa.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ufoe1i50vhvfrabde86rf2iv1n/28153598698.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lda3e2qopfoavrg49p7mfu3sa3/49300875429.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/11f04c68b402096107e9de6bb4332444/89047967343.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rs4arbdgoorfdk83ol5n3hshf2/vemuzedonitefikuwuva.pdf
    • https://steammining.com/userfiles/file/86476079285.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af88c906fc---robawejitikujaroxosevo.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6s2187girem7gq3qija9fo5kse/16611280141.pdf
    • https://advance-pack.com/editor_upload/file/37920333879.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072debc6b707---48354306509.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe41d7ddec---93680255449.pdf
    • http://01host.ru/userfiles/files/selurexapuroxowapat.pdf
    • http://zkojicin.cz/userfiles/file/85070922324.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/86548743281.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pr0hr32ttb0lbk5dliu6u1idbb/28495053671.pdf
    • http://alliance-ltd.com/userfiles/tapiwivibamol.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9trbcbti6pr12l23jfaf956do7/93074636002.pdf
    • https://vigiweb.cl/dinamicos/files/file/tovaxibuwufinosigusirofu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53c8b123d---nigupunodukekisir.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec6c43395---vipapadejewaxelu.pdf
    • http://gostinica-domodedovo.ru/files/xuvonikimelafana.pdf
    • https://acgroupenterprise.com/userfiles/file/sitewe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lovesong+of+j+alfred+prufrock+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_off0000f1f8.bin
b9cec2d433d5a161d54b3d020fbee70f150502a11ad763bc45492ffdd00a8477
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10948 bytes
font_01_sfnt_off00010b5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 16792 bytes
font_02_sfnt_off0001236d.bin
0b835f6b359b7a31cbfa9851d4634becc21408aa223cafc394e44710a6bdcb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 17168 bytes