Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cf8b74a99aa32d…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 02:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43bdb0812a822c3e42c1d441f9c509d1 SHA-1: 434fb18d56fdae42b182e329dc911fc68b04f4b6 SHA-256: b2cf8b74a99aa32d3ca8393f325c607d39cd109bb99a7e00e4d7325152297a04
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af921605315---13304905708.pdf
    • https://ratco-hardware.com/Ups/files/64183562467.pdf
    • https://cafe-malaysia.com/contents/file/8287781127.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9977d9330---tilibas.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa53c952f1---talonovupusirixatazekuw.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c704d658d---61453627803.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/zisaxagobosanowe.pdf
    • https://koratspring.com/upload/file/79112639459.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd02dcc7a---fafofivonepapigozij.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ce113c2e---xenevajusizajeb.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b86aa996d06---12557439948.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c82ec1714e0e8a78b2bda5b53c11d3ff/jumafafokojel.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5b429258---57475904554.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082d33e5c083---kibabuworotigowezibuso.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/68190881d60419eb8cff1571171d292c/80094474251.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f972c036a---60311969839.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc6870ceb---94225653493.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a21338c3574e915acac891793f8fe5a3/xonoba.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6995ac3a9d---69774334197.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/794164513e1d812a9500a7a4e6e8b4b0/guvukozudomijajedamo.pdf
    • http://nordicaluminium.ru/userfiles/file/82001310488.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c4d88a09b---93062448816.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1ae8651a27ac39091b8583f6a6f364bb/22827506735.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=answer+assessment+questions
    • 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_off0000fc65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 16792 bytes
font_01_sfnt_off0001147c.bin
24de5d7b56b538d2d5df3a18812f99b87bc8ea1e9b6a0fa83a51295da838cea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 10536 bytes
font_02_sfnt_off00012c94.bin
e4e325ea2a288655d57ddee6a2699920c7ed59c1f38c83acc547da828a45fb10
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 17348 bytes