Malicious PDF — malware analysis report

Static analysis result for SHA-256 140f66482de48f84…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 17:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f38e3c5ff7fbb6d8168cdaec4dd3fdd SHA-1: 4593446b40c4b4fd1e9f6d9fcf9f1a0a2e83dec0 SHA-256: 140f66482de48f84e63590e1031c4cfcb9e3336a162861f907b43424c6367c81
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.alcera.ca/userfiles/file/2607624633.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/ladejutijabetilupalejej.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/kirakikaxadurizupozo.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/logokasasawininami.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/suzamiluzojir.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pfoqc9kojk125buh37gpc4u6k0/suxegodafof.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/55813343366.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a010e0d4---85937229271.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/72658353068.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/jenujugabuparewudemuf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfc6ca683---87228089231.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/fepexosejaz.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36212725086.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/balaxibidivonifeb.pdfIn PDF document text
    • http://ladna.pl/user_images/file/77041553073.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/54294556528.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/nabefaropafojuv.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xufebekamivoba.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910065418489531.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131483f78f6a---wasutef.pdfIn PDF document text
    • http://18554080.com/userfiles/file/3010454136.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vagizubugi.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/90697617512.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/dedapoxupofuxod.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/96582020638.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/mapetuvivigonom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+wettest+county+in+the+world+pdfPDF 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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10816 bytes
SHA-256: 68be2346749303ff0c99d91bc589198143c873af87cb6454140d8db797a35da0
font_01_sfnt_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 17432 bytes
SHA-256: ccb72cabd0dcf39b54b0c6234b51e7ad174ce3fab7da22371a6d656f07a37be2
font_02_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1