Malicious PDF — malware analysis report

Static analysis result for SHA-256 779249c24e0d7c3c…

MALICIOUS

PDF

91.9 KB Created: 2021-07-18 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37cd1071764c10142b40f71b64be8f59 SHA-1: e6a19c28cb9382a5c8ecb909f822f030e68bebb3 SHA-256: 779249c24e0d7c3cdb837c9b75aee03e3433f9154d20a4c05d442d7fadcb2760
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. Heuristics identified it as a link farm, with numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body was unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or SEO-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rub895lqbc1blmdlpgn7dj33fe/telinojuxasutedidotelere.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/zapixadujaduvajujaxekitop.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/75e270711d9ca571473c060126e17bd5/21020788554.pdf
    • http://grandinhr.eu/images/user/file/ronuzi.pdf
    • https://alice-immo.com/userfiles/file/17656793318.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f99c30d07---tixabetipi.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/657d2953746a95a699a398d291f1ed96/23870701310.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/13b31566000d90d1aaed399e5c1fb100/49831489273.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7005443309.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d55e1995---55584635237.pdf
    • https://comiconfezioni.it/file/18053485681.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/sumakebuwavu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868b454154---64697793317.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdf
    • http://skpizzasubs.com/uploads/files/somodegopiji.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/81107123917.pdf
    • http://lycee-elm.org/userfiles/file/89501760327.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b972569c6d---7146093411.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rexixanojepuperemosomivu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1bfnr1bjmseq6g4fo15d4n81m5/60525184895.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2d2aa87b83e15911a6c2f5e71b388f03/zenitaremolapodepew.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e5c410199fc47f80fa97c3d42b144def/77312777222.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79b4fec4dd---minesidufusutubalozujapa.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd5101219---kezitulomod.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/97489290002.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+my+notary+license+in+pa
    • 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_off00010269.bin
dab8ee5f4e27c13dd4796903a9b6378506833b5a7e3922bd5d3eff08adb24aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 10908 bytes
font_01_sfnt_off00011bb0.bin
2c012b898c5373600c406e358fb57d7bddcaa1d284f825755d2d4e0b04b5a82e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 17612 bytes
font_02_sfnt_off00014a0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 16792 bytes