Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3edcbdff044335…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 15:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e53f0602cff6e2276348e29586f663c6 SHA-1: a0dcf86798d3806775ce760d82ff93b88a4fcf4c SHA-256: de3edcbdff0443359f3e4a5db4338b26ddd91538edc8b49f7c245ebcc7a05441
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it's an image-only document designed as a lure, containing a click-outward action to external URLs. Multiple URLs point to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fotokeramika.bg/userfiles/file/19718363956.pdf In PDF document text
    • https://queensflower.nl/clientfiles/murorenawagabuvowewuko.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fogizogawozazopa.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/63399622757.pdfIn PDF document text
    • http://c-amc.com/upload/files/jideveto.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210909141452.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/mojozuderiruroretasoto.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/52275355793.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/wudilefa.pdfIn PDF document text
    • https://fobh.net/userfiles/files/48724697800.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143b284a4da6---zesixosimoze.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/siweberuwutufudu.pdfIn PDF document text
    • http://keacg.com/upload/files/kirojujimepeji.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149d64239ad6---bumadejuzetiwadadafimik.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/pubewakakumimoxejud.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/puwirumudafew.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/wuxek.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/89550048711.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/83723776395.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/zowavawojulerunexunoto.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6564cd2c8fca50c4bbbac9653c8cf866/vunefazaminiw.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/zilowazebemubeten.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/75432937388.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/mufezixowawemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+movie+maker+is+it+freePDF link annotation
    • 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_off0000ae4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4D 10704 bytes
SHA-256: 09c3323b1c82d1b43ed95470deea108a91e071f273988335c3e5f691ea6fa39c
font_01_sfnt_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 14096 bytes
SHA-256: 03c847b1005d3db5dce389cc0b638b219c2e998df54945d03ad75c6c73e37b48

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