Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cc3956190f1b2b…

MALICIOUS

PDF

88.1 KB Created: 2021-08-26 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf4a85252fe5eb0cb17aef9336485177 SHA-1: 520c8c2dd85b729f4c89fbdc81dd9fafe8228c39 SHA-256: c0cc3956190f1b2b917f6e0c704d3690b4966a4532e3a08c2d134f47844cbacf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The presence of multiple external URIs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=pdf+financial+accounting+books PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a211890f5ca---33240548519.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/gizenonesuvanagefoza.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fd0b8949---30003685480.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23e0abe8df---16584939078.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86364293811.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/46b6f4f45fe8f9ff3cbd6c4d9460d53a/85032708473.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/minipow.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5c7b13b84de55ae8958ab642f6b9285f/vuwopikakaruneduvodanego.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bda34edc3---zusozok.pdfIn PDF document text
    • http://falerisztika.hu/tmp/19871964045.pdfIn PDF document text
    • http://yongqingtech.com/d/files/73168055329.pdfIn PDF document text
    • http://ipllaser.in/uploads/93893038271.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/23496243331.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/tobifogewux.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/54602844318.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b21c6a1a8---51598535656.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a399b958d---godowomaxogaluwa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb181b4c---78318335195.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/kodanirokusekarupusabu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f8f3f6fb---figujilivafiguzoze.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kanubufevuvifapepule.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10752 bytes
SHA-256: c19766ecacae29f0166367dddaf44ea1ec4a4adefdf4b68e241bb8fccc0eabe0
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 17468 bytes
SHA-256: cbaf888cbef17530e745c88be3e178db1c2744104301067f9bc8ca32854bdf86

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