Malicious PDF — malware analysis report

Static analysis result for SHA-256 7798332ac581c33b…

MALICIOUS

PDF

76.1 KB Created: 2021-08-28 03:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b503d2e3ef01dc49f24385015e15f5ab SHA-1: 6d1a0c5492593b9762edd02654b9f2a74695fcd1 SHA-256: 7798332ac581c33bc1578329a3d04808923af9a8f55e5fecce36b90408777fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=barr+bodies+in+males PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/xinupekebelotibidolasaka.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/94458116370.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/zojonezesatufumegelekux.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/32188995153.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/21610378765.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/nusuwawo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/icod4bbnmujko8i5sejl53nh40/5569417071.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///xumusixepidujexalis.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa609b9f47---40472010379.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/widagafunosiguwara.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e40eb2d7---vigoxososawedova.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5a02d9e63b87bb83c99af03f1be7f260/48347139338.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/50199475930.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806edbb0a4b---badojanalu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5a57d4c98cdee034baf3cf60ab82b627/20359474356.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/kalopujigenatoxonozin.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/toxet.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wabijaferekukutozopugodav.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/58703128008.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/57024557809.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0686fe2e2791e555215f06565ba8398e/gipokemuvolagiteduzelasop.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab319643c---7426593466.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 10504 bytes
SHA-256: 6cd8c235801b6a0c4fcfb28c6890ac39341e4024077be4141dc02011e950ab18
font_01_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 17416 bytes
SHA-256: 732d7b19a20120a49baff0ef90626e7461eabbbb5584afa659860efdd25b9565
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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