Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e699e014a0c1d6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 14:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07d2aa9c19795356ca0316ff0b84189d SHA-1: be5f2c30c87ff83f47094200f85d4fd8131c5707 SHA-256: e5e699e014a0c1d64088afb90ee0afbdfd52b20b8d0de44fced724307a6b0519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used for phishing or distributing further malware. The embedded URLs likely serve as redirects to malicious content.

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://queure.ru/uplcv?utm_term=square+root+of+81+is PDF link annotation
    • http://insfilings.com/skyzone_classic/upload/files/68112837108.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb0a8be29---7195931316.pdfIn PDF document text
    • https://esvigo.com/upload/files/14272711894.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/tarutesudojanigumunajufoz.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/27607587165.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/kawid.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/nukuxewezetegodezaxadi.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/77504449127.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/gurovepapesufe.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/momapunijunajizemetuzu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614049852757b---tabare.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mepokebotobojojiris.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ee628093---71928172581.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f888938ceb---67014818161.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xegimaganunovugev.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/bamulefefepofosinigoladal.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423b3c8ea18---tonamixivabotolivobax.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1dd6201f1---fixizad.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/41302371287.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/69368040085.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/vusiwujuwopiwugufilakanib.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c6f36643.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/fusebidegesikapekidut.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161513407c1a50---narof.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/69047455237.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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10636 bytes
SHA-256: a0cc18bd84646d0a6844c1a302df27b2f10227bf3e321cd8797aea2f321887cf
font_02_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16152 bytes
SHA-256: 638fd99e71861c22df48ee5593ca1caa7c8511b4163a7132524046d8c445b82a