Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb21850556e1c0e…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 03:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 466763de581b3f5e50f4e7e2fdb8d340 SHA-1: 6562ded65b61f7cab761f21cc1aee57b0a3365fc SHA-256: 7bb21850556e1c0e429d4d9b51ca440281c26ad8d8bad09f5610bd000b131769
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1409c0059---13553065956.pdf In PDF document text
    • https://kueapem.com/contents//files/xanexegom.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47013974144.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e885e5da3f694d2852cb898574eb4dc1/jeduzow.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zosejuledipiver.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/78309993201.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/34609364205.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb40295a9---xubuwolubelubiv.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/13795414067.pdfIn PDF document text
    • https://ijpdua.com/contents//files/45171540463.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/37964637435.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/suwalejudixaxu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vozuzevup.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/luliziledolonelotedaxutu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc0c55f42---betofizoromazu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/42198548926.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c94f451e6---dowuru.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/99ebb2e9dcb3c010c79bdde91965b250/57918729709.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc50c62a8e---57088169044.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/jasisamomamifulo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/30035409783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dingbats+level+234+answersPDF 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 10828 bytes
SHA-256: feca8ba1f45bf768984cb5a135185343396971d2ced9331a5a00e6a56d1960e3
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16896 bytes
SHA-256: 953476681958fcc9531e0ead574b4dd51ed4127d79ca677a7d7e54ecc32775e5