Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17b7c454a1488cc…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 04:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d569a0f811932c3c1bb723e597d7e21 SHA-1: 155e6a0098625acce5b0b59eac7e7a9962ee6a95 SHA-256: c17b7c454a1488ccacc92bce0cb4039b4a56a9f0d3c263a3140e4e2b05716712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm heuristic indicates the PDF is designed to redirect users to external resources, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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
  • 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://andreaslasnik.com/data/files/65276209532.pdf In PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/jerejaretiso.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/pagiveli.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/duvevunobawosepugogumivar.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/19792956951.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/pubimukuvewajogujegokomom.pdfIn PDF document text
    • https://bczenekar.uleshuzataruhaz.hu/files/file/lapusozedetilimawo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/55741816b7d91489834cd51b53c861fd/42967970231.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/nopuxa.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/seruvadokojeme.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/lepojedog.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ac7b98755b3f4053b1bee79ea82854f4/95368474615.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/5084542682.pdfIn PDF document text
    • http://congluc.com/upload/files/10274819572.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///57076484959.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vuduxutakisojufadulamo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/795niu3g104j7a2jqa97bkllh0/lepoxilir.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fepaweladalokupowa.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/botusitegoberujulabidenu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/49408182151.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/90877305324.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/libeviwiwuwalolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=synonyms+that+start+with+lPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/54358298042.pdfIn PDF document text
    • 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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 10516 bytes
SHA-256: 020fefe05ae05e91fbb48fd637307c31c400c9d7ee1e3bd02e976d348a151ddc
font_01_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 18080 bytes
SHA-256: f04c087df96715812c1708bcbd051e0217011e2cad5250ec0d8291e7dac7d61e
font_02_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1