Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f293e1bca060fe…

MALICIOUS

PDF

75.9 KB Created: 2021-07-16 00:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98bd7fe1d05e8aaeb04d418d382aee17 SHA-1: e39b941ce1983841417ba4ce1e73606b01888ef3 SHA-256: e7f293e1bca060fe55f08bcd716e3f7e4e68bec96e01667b89e8dc6bca3fe30b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous links point towards a link farm used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=liberty+university+scrip+dispositions
    • https://x-software.cz/data/file/86431342128.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9611c8440d---60646148422.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jenumuvetilupotan.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ecabcdd2a---mexutogumanovubuxeloti.pdf
    • https://acryl-bg.com/userfiles/file/bizobojemo.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2some81ar9mr0noidsb0am5tjl/24219780131.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14fc3ce7b---1406297125.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ed462a46b926fb3e458da7344bfe4814/97627092483.pdf
    • http://euro520.net/userfiles/file/1625314076284158375.pdf
    • https://museuminiaturesbesalu.com/files/79556058075.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jlvj8fk4pfc1nd6vg0075goau0/suxomajofokolow.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bjjnfp0ujhgofm6jar8rsn4vk2/fuzuguxogibikegolole.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e3bb4defd711847720cfa93acf52b507/44913200518.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a3qdo8l94l0djnpg3unrmg6016/wosaragipabimusezez.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3bfadeba---vomabuwasojadexodapa.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e67a00088---68416790587.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/64788fce172ac98a1e818f5749f2b8f7/zalagujes.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/92421972465.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/07efb2eeb145ae837a1462a103ff796c/kuxaxekejibif.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e83k5svocuqqfupljd7na544g3/gojolojolefugirogipovap.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_off0000c7e3.bin
aacc77974ea3f91e0d4dda027cbd5922f356366409afbf8e856979e042919844
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 10676 bytes
font_01_sfnt_off0000e056.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16792 bytes
font_02_sfnt_off0000f868.bin
035767d766bb822d85fb0a2e368c0c3c025f3cb51f0efc0e78776a86937c7a84
pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16136 bytes