Malicious PDF — malware analysis report

Static analysis result for SHA-256 caacc399841fcd32…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 18:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: decfa40e00fb1e35a63384c6df73d588 SHA-1: a799bc83cc3511d8559b4f7c2ce3c98f5f2fcbf0 SHA-256: caacc399841fcd3296c9b1c4e60e1dbd1f1048d8b09627e19dd11c68435473b5
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=delete+system+apps+without+root PDF link annotation
    • http://abyss.sk/userfiles/file/54920162905.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/23480844911.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/rokepuxilorububawa.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/6561869309.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613174cb5fb09---38534543413.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/getatodiwazojejeda.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/13101694769.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zekizuluronuwovuroliz.pdfIn PDF document text
    • https://mediaskills.rs/files/bukajerekevakewabixogu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u1k3uq70h2f1i38lq7o9reka24/kuvuvezefekega.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/37056868034.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/41552263759.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/7423975713.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/94583489090.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/genatat.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/leveb.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd9e99814---sorenibe.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/riripuzezuporeserofinux.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210910150905_1345535177.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/26635500030.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xogonu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c9b8a0d88---6928347109.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/94060023374.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lagubiw.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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 10712 bytes
SHA-256: b76d09b5a073dd54a0c953fd7c78160f1a291277d59f117b3d4aa502f691272e
font_02_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 15348 bytes
SHA-256: a5edfc127846ebdf295b23554cb17d72f38a76f59abc142ca84bd15092462185

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