Malicious PDF — malware analysis report

Static analysis result for SHA-256 a202c5921be5b080…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90881e2538158110f033a6407080f528 SHA-1: 1a85a269415e98d93274867fcde64bf3f4562ee0 SHA-256: a202c5921be5b080fea510f37dd77268dfdac421c7747d593ad91abbc64a69f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lnv-cnc.gr/userfiles/file/66322257975.pdf In PDF document text
    • http://kmconlinecme.com/userfiles/file/65581561631.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/dofijag.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/70961533576.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ve80qkpdjmsa4baopi5c96do2/sezume.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mewesojitalawumetuz.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43715651703.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fadufunitale.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/45371736738.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87201802602.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/92573692735.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/42090422451.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/85795811223.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/52606554324.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/43452806486.pdfIn PDF document text
    • http://juncheng.tw/upload/files/rutijukisotamupuwo.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vadafupebofer.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/6087805591.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/xufulom.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/86221335809.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4a464e46---kutozekupemoruvipomi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e34f995ff---dakavepezivitumosil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=random+xbox+gift+card+generatorPDF link annotation
    • 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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10892 bytes
SHA-256: 14af4ebbf3ab7ba60d27f8ee97185cdeeabf2996b734b3b2c4fe2d424c01f4c0
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 18668 bytes
SHA-256: 2f0805b60fd5472d4ed1832c4c6cef3c3e42a8a35f0dfdf39bb9d2b8d92bdcbd