Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f35e6e625aff765…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 15:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0112a1eba3dfd4f75b0e8aa598afa8ae SHA-1: cd423ff0728d9f603e73dbb838931becbae9ffec SHA-256: 7f35e6e625aff7651daf3bd0617780f27a88c619dbf3ee52cb5d645ba729f77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it may contain embedded JavaScript or exploit content to facilitate these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://metrocars.london/survey/userfiles/files/72923365144.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2020e937---relojivusewalexi.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/88515133224.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/15150531326.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/nazajoragoxi.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/36064217247.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rakaxujeguxixozavobus.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/guwotokivesenukerezu.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/45923583303.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51977562154.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/31596526637.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lesopifefetidopa.pdfIn PDF document text
    • http://sgpeo.pl/users/file/14790878724.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/717db9101d7dde91aeb9de36baeb793d/pidolimufuvanu.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/womazubadubuterasesonerox.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/76630729353.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/zasomot.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/57206182996.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0a98151d---9408148801.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210917221103.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/pujofidugajazaxatax.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342870a519b---migowavigolekevez.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/78171657288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fancy+key+mod+apkPDF 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_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 10352 bytes
SHA-256: 9b2962c93b1e148a6b4dc548990931f22457f5ba3db1337d7980d08d43e83aaa
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 17528 bytes
SHA-256: 87779be47860085be3cbd2c2b336ae3d34f3174cbb93f3fafd68a47b7ccbfb6d
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1