Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8c3fd37ed003c8…

MALICIOUS

PDF

114.8 KB Created: 2021-06-29 19:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00fcf192cdf26ea4d31dd2e7a627c9ad SHA-1: a88064521b806715977ffeeacbaf178d85a3445e SHA-256: ae8c3fd37ed003c8937f9ec5bb75d0d060c8236565ad41cb624d74792e165c3e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://laborke.ru/uplcv?utm_term=to+clarify+doubts
    • http://chongthamnguoc.vn/img/files/zitut.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e31b0a3483cdf99c0190f576b5e3a040/70952912601.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d4993ef26cd97cef9deb6cbdcfa0d7ea/65438048070.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5a93b0c3---4331732429.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecba9ce71---wafunipikalu.pdf
    • http://www.aqsclimited.com/EditorImages/file/pipageronapotomevog.pdf
    • http://diacritic.org/travel/app/webroot/img/files/55941819626.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/683f7654e972ae04a4aaaf34c5e67928/suxagogemizaxexadaki.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nepupupojuponi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e2719524913db5a650aeae29a5204a51/90137925249.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/94847739750.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/watofagow.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f8fe25e3---50176773316.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c030bf0886f---24696247847.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/wetewis.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/kuvatawidikudobuxuj.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/44306bd8416d7bb782c63cb1d83ed463/dujarajetol.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa24871bd6---61628296134.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5312225d4---foboxemip.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e24324068080e05e9790f47ed6d81487/zulupetij.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/46dn02hq41ab6nv2q9nhr27jeo/terafolix.pdf
    • http://bajajsports.com/userfiles/file/89835133526.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160708c04d8e4e---15726806980.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f88f38ccb9a9a94348ee07a051693e85/napotejuwuwirekojavozep.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608429780da23---7280411062.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6s48ipqtqobu9jau8g8amajl2q/lidozitudav.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1fa48d49c3c7441c33c5f9eb9e625ff6/9711232289.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef4.bin
035e95108cc688cc9fd4af7231667ad947817c02a0194a9d58f565c3d71d8d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 10552 bytes
font_01_sfnt_off00010727.bin
449b8ede930205c64d4165e7308bc075c920a600a2f595c8ee83851640cb5b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 41672 bytes
font_02_sfnt_off000175dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175DC 16792 bytes
font_03_sfnt_off00018dee.bin
81fbcf09144dfcc64d8e77fe4696b223a291d3fb2b5b1a5eb5cb6e6d82be7866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEE 18076 bytes

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