Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fa82468c72211b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 20:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed701114a8650679e422ea39a45b8d64 SHA-1: 0a949d41509da7ff7db4937adc9e0ee0b759c152 SHA-256: f9fa82468c72211be1b2a035cac8ae31602dba1937cc10f35231a16335dafbbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kawanmto.info/contents/files/kusapi.pdf
    • http://bibliothequeanglaise.org/upload/files/kejeserazegolam.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a87cab92355---14606502212.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f91c463ff099794593c8f7627caaa69/wikoterukabapesef.pdf
    • http://emeat.ru/var/files/dubuxefapafomago.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a2f65fd2---61175471356.pdf
    • http://sbs-group.co/userfiles/files/tamubig.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/bufudiweje.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/79229686895.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b198e712496---zurukifakalivego.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210725_F2667A6616BE6E54.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/zafijaju.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8c340163d---38922419000.pdf
    • https://akproauto.net/nbloom/fckuploads/file/89309587245.pdf
    • http://zhuoer.ltd/userfiles/file/68727021038.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af6cbf42756---xugimezigunoregiraf.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/87068090921.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75b4edec0---71239629109.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0f4160e4---remonazufukep.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071342be2b0c---bovomux.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/078d38ab63dc552043372176ddf034a7/88190015080.pdf
    • http://thebankcardservices.com/uploads/files/22063211480.pdf
    • http://starinviter.com/ckimagefiles/89248666438.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/58164056907.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876e15cbf22---50530678189.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f275b750---sebakufakadinamubobax.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/12282502562.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/101f517d346783455b957df7ec330059/76216710766.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=standard+assignment+format+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_off0000e444.bin
91dc6d27b3fc3f7bf6c5a9433f1a16d75135af5384a35a13c3d7a74360f34623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10872 bytes
font_01_sfnt_off0000fd1f.bin
b91f4d3d2dcdebb8acc8afe72efcc0324165bfcabbeac948cd53853cc7f5bbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 17524 bytes
font_02_sfnt_off00012b36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 16792 bytes

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