Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e636210b3cf750e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 09:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f9eae521182e5018b046333fb9256d SHA-1: a5e582bb9486e2086da3ad4d66ad5c9bfbe09090 SHA-256: 3e636210b3cf750e18e9d0a23339f1ed168a2d36fd0a513872acececbd63831c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful content, possibly for phishing or SEO manipulation. No scripts were extracted, but the overall structure and URL distribution point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=how+do+i+insert+a+new+worksheet+in+excel+2016 PDF link annotation
    • http://dralituncer.net/userfiles/file/vuwalixijavesuvipovuw.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fisakofemigojuxola.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5fa2a7fa---siboxuzoxotabovexozowosi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pue0q56vlcdh7ptb0bfv4057cb/lepubuvizusulopetowuli.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e4766732---60504185408.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/zozivawogisugoxe.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tonugusuni.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d02bc4c7c---sebowel.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/71442351787.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/29035523648.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/mepajolavobezixoluzib.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/50162751521.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5b8cb5307---47201868207.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fbb5dbe0e8acfcde75e0023933b4b544/jukovotawapakatupifaw.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18be23365---63569425590.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d192d8c14---69015641086.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/nemebowipupatikerotus.pdfIn PDF document text
    • http://hopkim.vn/upload/files/vavewusitemasavutizeze.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wofag.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/33952886870.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6fbab7e2eb6d71928c0b8a154881b63e/4241608651.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/55753802733.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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 11200 bytes
SHA-256: f906e54c328236b9a1dc3b4b5e01dea139698fe395b7c0b55fe93589b23aa35e
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16788 bytes
SHA-256: 31c609573139348646461f802d9800852ab78a10676f6bb18ba7ec2e65710e72
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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