Malicious PDF — malware analysis report

Static analysis result for SHA-256 242a0c7511d721e3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f875f82a24edf8a273967c595b0764b8 SHA-1: c4084a640f07bade4cbd0e208da905098ae6d0bf SHA-256: 242a0c7511d721e37f6f65f3a017c27f1ae7e7eef61cf8611e6a3c3f489dea23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or tracking motive, aiming to exploit user interest in topics like 'backup android phone to nas'. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=backup+android+phone+to+nas PDF link annotation
    • http://vektorma.ru/uploads/assets/file/pafigaravozunejeragabeta.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f252d3fb45---45696520747.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/tinosizuwa.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tidejesododebom.pdfIn PDF document text
    • http://anpharma.net/upload/files/taxanerogiz.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.pdfIn macro / runtime command snippet
    • https://habibitoursegypt.com/ckfinder/userfiles/files/gogebobuwe.pdfIn macro / runtime command snippet
    • http://ventexevent.se/uploads/file/84106033272.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/78105280816.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/27943215333.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/lolejagud.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/25449229667.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wakebifaselopemuposeraj.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/difuludotixugesisutetel.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6b928d86f34d9040a57e1e2ecfa9c4f4/juxogodisifuwakuwadilazew.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60292202871.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/56408754371.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/samavakokikurumetitemogi.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nodimapilulubulabebuwa.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/buteguzirofa.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/lapelolirumajuz.pdfIn PDF document text
    • http://alcantara.cz/data/file/6965772841.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/23246533162.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/2390998053.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/475c0411032eee9eaeffb09ce9402dfb/gigorotuvawazeranos.pdfIn PDF document text
    • http://anpharma.netIn macro / runtime command snippet
    • 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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 10808 bytes
SHA-256: d23bd2bf15df1c94cbbe8e21ae392ece55dc728e1fe092afbfa19a008441eadc
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 17620 bytes
SHA-256: e102a1b767bb32800ce8280c5700df4daa1a2ab68bfca85497e65488d219abc2
font_02_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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