Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8e8e7a518634f0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-07 04:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c308fe69d142bfd809a3f0595488308c SHA-1: 46076addc2bbcf99dfc8ab54d8b31973c142d7ec SHA-256: 9a8e8e7a518634f07a42b5353d744a7ac4ba21b6544fb0aab250ae96a79f7edc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=solving+systems+of+equations+algebraically+worksheet+answers PDF link annotation
    • https://tenfci.org/userfiles/file/34825926967.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/baecdfff92b711901341c5ff343b2c4a/mojemofir.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d4e299d4---86727206871.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/76686351905.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/javewamanidiviwid.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/85385188735.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/2530458694.pdfIn PDF document text
    • http://simonide.org/userfiles/file/felolabobojawupabizib.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e581d1ab46---nimijawibipojuwuves.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cqtn08ref849hfrosl3s0b4mhi/tusetesonamakudi.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/xurejeden.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nodutinabuzomidewabukikop.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wodimuximowagijerat.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccebe653c---55227480705.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5cbidrdbuahehh3j05fnqvl4p/lejozilaxemojuwapoxas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6fd069599d229d97ee12e9270aad49e7/91832195267.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/51058482534.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/04eb85bc3375ad87b03de89b8b5aac7a/13058468693.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/mikitinetibaxazozutidejar.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/32950264181.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d165ad7bb7---82689158854.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/de77qkk4n5gdevjcsp05d21urm/degujaxek.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/gojelamidema.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 18048 bytes
SHA-256: f731e469d828b8a177543c650374e517332faa6b659f8ed18701d03bc6dbb312
font_01_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 11604 bytes
SHA-256: 2ba15103bb3dcd14ccdd331822257a2eaa370f7a548a7ca717fc63f242134517

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