Malicious PDF — malware analysis report

Static analysis result for SHA-256 037f27a755216e84…

MALICIOUS

PDF

116.3 KB Created: 2021-07-30 15:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a008c54133e63948b08e25a52bd6d7c9 SHA-1: fa8805fb452b367e2dda523e55607c22549bb997 SHA-256: 037f27a755216e848b7f2b1a825d2b1d68af0f8fbd5106ab3177de232c4d2eac
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c933648f090---puzixipa.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • http://mousike.it/img_ins/files/delalo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mocn66j0630ov0ep33egj2ft66/lopumari.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/95790313462.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ohvd394s4b1rtkvtm8t4ot7uq7/58231369421.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/ruwuw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce75ac5302---xomirikadawesel.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e4543e6a---26196510783.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/057fabf73bab4d956cf506d9e6d7e04a/90512475792.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/32676326109.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210710025720_225213151.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fifapesinexu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/25203619957.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa7646463---gidema.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/vitefolevexaxe.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/3eohuec73i5ncve81an4bs47n2/80549381265.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc3514038---rifipufibeme.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/15014882880.pdfIn PDF document text
    • http://thedreams.cz/files/lobiv.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/repajoxakar.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/74a65adlp8r23t8l9su0m5clf0/20522207702.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/nazazaxadegesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nombres+arabes+con+significado+biblico+de+ni%C3%B1oPDF 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_off00015f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F96 11044 bytes
SHA-256: 4f57e76d5350781ea5ba97fb996512e32ef38c470429cf13971d99564ad1b182
font_01_sfnt_off000178c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C6 19092 bytes
SHA-256: 4c9aeed06e38529fc8342883ef2bd9cc3442b67fda3022d9d78925e156083a3c
font_02_sfnt_off0001a824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1