Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbefc10e3dc2bde6…

MALICIOUS

PDF

93.2 KB Created: 2021-07-07 12:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ffb4baf757af2e989e9dcf98b919e67 SHA-1: 9999c5e32fc2aa830ed8257fd344f675e815dc9a SHA-256: bbefc10e3dc2bde60a72e15c97789fac4f4762d17609ffdd3f2f7bed0e03193c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of numerous embedded links, some leading to potentially compromised sites, reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5b7ca635431767ed399d1b8e07f32415/24274490109.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910f5f1792a---58807945843.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609466f17af60---fenajotivunafapazu.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e967cc3b4---podapajak.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b819fbe3f7a---25612874318.pdf
    • https://catbasailing.com/upload/fck/file/46859161140.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gdur6fj6kl1qbhrfej6muuss1u/50732830559.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49482646---gupewazibil.pdf
    • http://fw-simple.com/uploads/files/zanisav.pdf
    • https://aspaeng.com/files/image/files/90272389611.pdf
    • http://suvagcentr.ru/userfiles/files/5833100305.pdf
    • https://avigailpekelman.com/sites/default/files/file/35795833449.pdf
    • http://hotstamping.pl/files/file/zeguvevimaxivizafini.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f579dbc73---31110917088.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75423bb3cf---75685644074.pdf
    • https://grup-insaat.com/userfiles/file/sewuxubuladizudowowaki.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/134c6cecf8da22cb1a95e4fdfd16e65d/suseraxobagalikanep.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/aaae2d7f941a2537851e8010f76a7ac3/kefiwoxaduzipabuf.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826779bae43---jodajan.pdf
    • http://dajuicebarus.com/uploads/files/nevak.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/720cfff58c9374182bac321a483049f8/70529289007.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1c7rugddja15d91hjmlj8h4bd7/zerujamogituvireg.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/31a850cb8b3738ef12fd7d35d9de3798/bewubi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e699c059---14354887381.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b06a8550---revususep.pdf
    • http://asupuro.com/user_data/image//file/3562218485.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=angry+birds+epic+hack+tool+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3a.bin
c37178892c861234b5c43daa3867ea72067c18b8f03b9054c919e3ea65bc529a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 16436 bytes
font_01_sfnt_off000102c1.bin
cb811916ced87865d6ac3e9d66aa7d8d778a8baabd3802050cf08777f022c7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 11204 bytes
font_02_sfnt_off00011c9a.bin
e8e87a9bd9eaa73b39e2ca0991702f57d76ad16b7cb09a52a1410d3947f318b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 18424 bytes
font_03_sfnt_off00014d04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 16792 bytes

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