Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aea21561daa11e…

MALICIOUS

PDF

93.3 KB Created: 2021-07-30 22:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8e21e7afcfeff9b96a21e3c775040d SHA-1: 30086760be8e42d1f5731d499a7a05808bdf95d2 SHA-256: 83aea21561daa11e91a4f0e48b857d67b9cf15c8bfe2f0cd38c8dae3bb4b26cf
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://infrive.ru/uplcv?utm_term=kenmore+water+softener+manual+300+series
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3e2408f9---jisufo.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c48ea8718---26105978217.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16103dff69ecf4---97730061392.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ff435c268848ee28552f12f3b935a6e7/tizenubavolirikijuzeg.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9b83cf5c1b9a4809cab30e7fcf855b2a/todejupuxosimusil.pdf
    • http://vidol.nl/userfiles/file/lapipedakozerepulafoga.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0d4938a1cc51c7a9c7e3920d7b57125b/riguxivid.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e5f50550b---xejewikivudonupoko.pdf
    • https://nmg.lv/img/uploads/files/69532448121.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d6d298b124d862b911ad2d71e2bf7539/niwazetiwesunopam.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b881901b994ddd98059401cfca03a0/94331668069.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af6bbde07---lukadiwinuvumovuteb.pdf
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e658ae71fd7dee47d8ac690b8717643/37150779350.pdf
    • http://davidlbrooks.com/clients/868292/File/77803983919.pdf
    • http://donateagift.eu/userfiles/file/bifonifunezidev.pdf
    • http://fsgpj.com/upfolder/e/files/20210606191746.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa985092fdc---pudosuwonuvolizoturi.pdf
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/terupi.pdf
    • https://telenovella-bg.com/files/guwabasuvojos.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a355bced7a8---nepimobud.pdf
    • http://1959blackshirts.com/clients/866684/File/tifaniwejexasakake.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_off00010876.bin
15cb4bcc6a4ef9986b5eda404d5f2ab82fda31d37b84cf9797e73d879a261f19
pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16916 bytes
font_01_sfnt_off00013496.bin
fdd89592096ae991fec98a914602f4aad8d6ea428a5c4591b2e9895e69b4777c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 10848 bytes
font_02_sfnt_off00014dba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 16792 bytes