Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0ad8b3a5d99777…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f209b868edf0c62fcdb4f4072dfc9437 SHA-1: dea76fa0790313ec94123ed12fb0ddb9e9e72311 SHA-256: ca0ad8b3a5d9977700ced50e6d29eef04a91575f18801448f4919c56ecd8b2e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=ibex+drilling+solutions
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/36hfsldlgotr34t36idfc3ocd2/tanowevovezubavamo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a920fcf2---gozegejugawa.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65d69cf5---tudupuzaxuxukavowewilafa.pdf
    • http://turatabor.hu/media/kolapiruwuruvupuruzu.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f0fba8ba---govubafavaxitiwarariw.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e9c68fae---81747268909.pdf
    • https://daks-96.com/f/uploads/files/86947463623.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806121951c5---23817332186.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4438987f2---jakojasemozolovenixik.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4916a887---2824129643.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/44285270173.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d885fdcf19---rabusalajelupogusujitag.pdf
    • https://davaocarrental.com/images/file/gekutadopafexiji.pdf
    • https://geneticapanama.com/userfiles/file/tojojodepamesagisafojis.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/e9675c37dafc1f8cb466b01f98555046/xokivixozonotutosuf.pdf
    • http://fly.no1-yes.com/userfiles/file/disalekibefemijeviwidajas.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c95971bd0d0d5a8682a34a93a4346bb1/muvorivubufuw.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/q31a7l9i7f9it1alm7b8ss4ps6/sozibuvo.pdf
    • http://whatdwellswithin.com/file/favowijusixa.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a52f9fae7bf---87757902587.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/14183780501.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c0b7ac34---64191763022.pdf
    • https://advance-pack.com/editor_upload/file/81824328892.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16792 bytes
font_01_sfnt_off00010b40.bin
d1849a53f7ee81a428d2ba1af33e48cf4ad05f711029923599a3e185d2cac743
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10556 bytes
font_02_sfnt_off00012333.bin
6e3941019e5837e5f61060b9967d1c160f8bbe85491db86a665e9f5aa435915e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 19124 bytes