Malicious PDF — malware analysis report

Static analysis result for SHA-256 039ee7c082ce342e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 08:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 018906dfd6049ca15557ff694645c864 SHA-1: 8b25811d0c2bcd16b409b03ebb4c8241ffacdeb1 SHA-256: 039ee7c082ce342e4fe68b4f7652e9444df1e257b0eafede623684ccbdc26dba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=emoji+keyboard+cute+emoticons+apk PDF link annotation
    • http://peetersinstallatietechniek.nl/upload/files/48067815780.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc578ec45---sobamigijub.pdfIn PDF document text
    • http://gibisch.org/files/files/xipaj.pdfIn PDF document text
    • http://beta-rc.com/upload/files/mavumogebam.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/60043165088.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d12ea10c9---20654371028.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/ramiwolafunewu.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-10/578e126d95206fb3bcc73a5adce98c09.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/35375687145.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/13465704362.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81966098932.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/11/94282347939.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/sedavajamojuwa.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f1eea14f---fizapinogi.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/53356711313.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/21730620847.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/korudagalifarojedituru.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/norozoxonifogakudomap.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/rituz.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/ximagaxakofud.pdfIn PDF document text
    • http://ametansk.ru/uploads2/40378048419.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/51248133867.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/dipetaraw.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 11188 bytes
SHA-256: 1faa8387a91c784f011b958e7ef36c5b11f70b58bdadaacf0b51c4e8f512e030
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 17556 bytes
SHA-256: bc14f865eabe8dc6fbbf4594ad6af3f92df9f5c07d7c078b5b3d230a43406778