Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c29a180dfae8303…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 16:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6204762aa82d4f390075f39ca87eaf14 SHA-1: c1bc1186c10581d5b7bb7c3004feb371a61ada97 SHA-256: 5c29a180dfae83032571e38414fa8294647e95ce968e67871946c5363a03954f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=turn+a+kindle+book+into+a+pdf PDF link annotation
    • http://wpchkg.com/upload/image/file/luwasizelumuvare.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/1060409156.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/bepevevunur.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b687b16bf1---visigixegoguzive.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/pasawaluk.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/50721528914.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/69686021888.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/594295067f6dc32713612075acfb5753/1783677280.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nagedigofunuxuvulot.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/futoganaxoxufagow.pdfIn PDF document text
    • http://laserinnsbruck.com/static/ramelajetular.pdfIn PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/bopikejisifuleseli.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/58662591296.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/jemojegiba.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/54057943663.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/23854387191.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/73309454763.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/safugobawor.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/ruwomegebobadiwavesigifal.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5493bd03---misitikexokenubujidetuwi.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/91686142455.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/63574204420.pdfIn PDF document text
    • https://mentormedya.com/files/lujuresaramibukojebalen.pdfIn PDF document text
    • http://jfe.hk/userfiles/13532848837.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 10616 bytes
SHA-256: ad7f92e3177db58ab46bee8c278138073aca524fda6bc1f3d35521a4bf5c991c
font_01_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 15764 bytes
SHA-256: a9aa6f818cd616c0c6440884ef116797b16b6d4ddd9d7bbe2d6e2c332b81cbf4
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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