Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfae47b01c11422…

MALICIOUS

PDF

97.1 KB Created: 2021-08-03 00:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db9ef08e4d2a0286c010b71bd7485482 SHA-1: df4d0bf242dd1a4740ef552f6a4122b33fe5644f SHA-256: adfae47b01c11422f8a15715250c3c90123a9910fd48adcd38ef1608b9905180
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous URLs. Several heuristics indicate that the PDF is part of a link farm, with many links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript and the nature of the URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7085

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=why+should+school+uniforms+be+illegal PDF link annotation
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b51d9f2d5d9---fizodajisodinewujuxowelo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wigufib.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tulojazojapadijevukis.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kusovavetaji.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0up00me4tjnshs8t3ulr30ij2n/95819469009.pdfIn PDF document text
    • https://linker.tw/files/lelugifojakobonolazuro.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/1669597300.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/16672541579.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/01qq4mu7g3v200mf4bbaso37h4/25508517151.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/57521627813.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd84fbb451---lekabevedobetef.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/9g2cs2u5s15dbagbchbp3m1rig/josemabimowaduxibupone.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/95818827803.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aca4a5675---zuxibewena.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/vejazifusufi.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/21552141298.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pitubowifigiwunojalopojex.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/94453667256.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nc7r9c9ldid31dcig011b8al32/rusivinufe.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/94495426625.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/duniforibik.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jikolabanowomigupev.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/99573434991.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f355b849---tixiwunabifu.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b15c822f7---femisuwuvenik.pdfIn 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_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 17888 bytes
SHA-256: 5d3aa03978c9492cca718c554a6207cc77e1845031bd52cfa37f4013fee2be12
font_01_sfnt_off00014fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC6 11172 bytes
SHA-256: 647e681d018fb7fad12764cf222299698d8821c2a10ced62e2ac26462c18768f
font_02_sfnt_off0001697b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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