Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8a3f6d36bc9491…

MALICIOUS

PDF

82.8 KB Created: 2021-07-26 11:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db6c88ee7b52545e31fa09e3b789c12b SHA-1: 9d81504367702edad457635a8967d3f54999b7c1 SHA-256: ae8a3f6d36bc9491738958dc07fb84ee8c040696a30ce4d24878ba022519c4a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites and disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://beateromer.com/bilder/file/bejikikisivepivovijimibup.pdf
    • http://phuocthuan.vn/images/pic/file/15651260687.pdf
    • http://arch-teh.com/pic/userfile/sinonelowogiziwotuxabubep.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40d643b9c---12792430210.pdf
    • http://agiusfuneraldirectors.com/files/file/2725239719.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e76d6c0350---fuvigopuselan.pdf
    • http://fabriziocar.it/userfiles/files/budewojepe.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/70cl5r1c03qeaue3o6il84q4s8/sofuximoguvedasagud.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r3mt91t2frtnk3iq4nnnn81tvl/37160427861.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fff45645---lebinejokutenaroxekuto.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/fedonedejuzadipuvapezi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607881827db2a---mozufekug.pdf
    • http://kolaykanal.com/userfiles/files/82189992327.pdf
    • http://kimhoatra.com/upload/fckimagesfile/16985457540.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/aaae2d7f941a2537851e8010f76a7ac3/kefiwoxaduzipabuf.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ff095b3c43d683098ea61115d5c96819/likugubuwalejebaraf.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2frmuafjgmmuam60i83vop7o45/baxitodasegeviw.pdf
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/24205548784.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/82b89ffb44b711c71a953c606745a2a6/66439099906.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4b7a1fb3---55810866640.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5ceede4ecc7f24bead755e4378068a83/58020959480.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/sn2j78pqnooo1baokpugq35vcv/22265689817.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sadlier+vocabulary+workshop+enriched+edition+level+f+unit+6+answers
    • 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_off0000de5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
font_01_sfnt_off0000f670.bin
66b5f291223b9cfb4df617045460c2abc5eb0d356631fa90ab202a36097de493
pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 16340 bytes
font_02_sfnt_off000120b9.bin
8c180c2557bb8d50c2ba110620c5bd5ca8cd68096cb40b46063a05f0a069b13d
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 11560 bytes