Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb297bef2c95ce1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 13:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c8441baa81058a899a41da2a99d9f67 SHA-1: a609c8984bbfeb6127c25cc59d95cbd576b44f13 SHA-256: 5fb297bef2c95ce181f301cfbcd539ea3ecebd64ea6049feba2f28a9a9193df1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious payloads or phishing pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852f8181185---75308684392.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ca5b4e4c---xobololude.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/wutejaximefezodutus.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1f05197df2353300ea6868b25e67d816/72385653954.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/orlmbbe12dabfjij39q1oh4bdm/xevaninawer.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/rulekexifos.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/ronoloforogoseveru.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjkendejbh8beigccvikhr5opc/18250172203.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/40776087845.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fegukurajit.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fda19ea8---30045457055.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rj6eaisa85qibs5tmljqf4hjil/xozisebenenijefepo.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/pedupisutuxudodeduviroz.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1i1nn576hi1uqtbj6utp8cdk8h/81836082608.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051010182029.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/24072172427.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/83299893668.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f866e36f6---kafasadexopoketokoji.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/purokemubifev.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48516892463.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0193da93---tusiparito.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nevemolevikabevikedim.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42386a6e1b46c9b4503238fd537a8ddd/pijemesitoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=schedules+of+reinforcement+worksheet+420PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 14620 bytes
SHA-256: 921c228a89acf28a2dd464da44aae57b4be3951bc58ad419cc2252204b94e236
font_01_sfnt_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 11252 bytes
SHA-256: e9b43fa18accc68943f3a121c980c6f4a7237e3bedd4d8b45b0543b1be3bf250
font_02_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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