Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fba5d903fe836f9…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 20:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 857d7d9cf4c5434440c1b646d80f3a3e SHA-1: 922515c930121372264bdb5d84d0721508c08b05 SHA-256: 8fba5d903fe836f90c3b6e50f966dafd8de0c087e14a4a2600abe8e53abc4256
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of external URIs and a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0adccafffe60a703ce0ce1d3efb9edbf/kalejiwexa.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ed788db2d95e7954093487ce4f746fbd/xogaropiwijuxudixivexafo.pdf
    • http://euro-ex.net/images/blog//file/kukedukur.pdf
    • https://aartipalette.com/userfiles/file/79720124966.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8801c1db6---sawilamemusowogogivonefot.pdf
    • http://peaceinsrilanka.lk/userfiles/file/jetadebi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e13745430---28347864267.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c246tn7v58dc235os9jl6hm8vu/6938306022.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830fff2cdbe---41046882700.pdf
    • http://ontsgoi.shop/uploads/files/sufapetofijulawaxemogajog.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/942666eb2e46f1919c940cbb0616abee/17001171775.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nbduqljr0demq6bq2557kpec23/kifonununeb.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37e0ffed20dc5c7835bb2a8218b98338/99134987277.pdf
    • http://podiummoda.ru/userfiles/file/xokiwakufozigejowu.pdf
    • https://cicadit.ro/UserFiles/file/42095191083.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/sejgb9uibea0rdovnic2d0huqk/26249558263.pdf
    • http://resortvillairene.it/userfiles/files/72839208944.pdf
    • https://hosvagyok.hu/userfiles/file/34602982892.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4344839d802561cf09718275dcb22b7/20403749095.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/24822854267.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325e957ec---kevuxo.pdf
    • http://reunionclass.com/clients/7469/File/jamapowofotosoko.pdf
    • http://hnspkjx.com/d/files/50975783024.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/j6lklfae15l68c6saui5c2aodg/fekovumawedorifuwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=global+environmental+issues+introduction
    • 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_off00011c95.bin
bd3fcc0ad464dd469b569941172292eec0f5e02300994a01dfc4fe5255bfa507
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 17116 bytes
font_01_sfnt_off00014942.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 16792 bytes
font_02_sfnt_off00016159.bin
26cfac8c3eae177ae43cee0f263a4f10d3f9e0f3a98092a8589254685b3c9d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 10876 bytes