Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af0bf57db66ffad…

MALICIOUS

PDF

76.1 KB Created: 2021-08-11 13:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0856b7fe01c08283510b96d25e7f8a8b SHA-1: 71356c5d782eb5d3a8baad765009731454f15213 SHA-256: 5af0bf57db66ffadd86349e07c355f7e5bf87779a3a1535e7707ddc76d57a440
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phish for credentials. The embedded JavaScript and external URIs suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://pixomot.ru/uplcv?utm_term=unit+operations+of+chemical+engineering+by+gavhane+pdf
    • http://intergeored.com/upload/File/21848227623.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/igntrusqjcoe8efrrlgghp9f71/24454927245.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0ec20c4b2---jitabuduvuposunutigosepal.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70556f206d---manusefegejoleboxaxas.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e1ee70bd---nupaduxog.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835ccdb2b1---xowesesigivizuwukuxumawe.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e0b46f03---40999207847.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be3fc1302---kilodoreselemewod.pdf
    • http://arredamentoambienti.it/img/file/pefaloriva.pdf
    • http://billedbutikken.dk/articlefiles/file/foxufomi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc95660e1cb---detobabevan.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cac59a625---karimuvudaxibinirobidizow.pdf
    • https://campermagazine.tv/public/file/54338116291.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a677f75f34b---54324997223.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m3s1h4n9h0231n7c7fo0i6kip7/sedukekoberipe.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592f2bb8dd---11439480510.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/dc2bbacc37a783252253447974b2d0eb/pasemozexer.pdf
    • http://laclonghotel.vn/upload/files/kosetudasogem.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/08jgcrt372m4bq6k5acvqul729/jigudowu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0858bcdf4d---54497106811.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae55bea119---zakopej.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xoxuwutewiguxege.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096364c3c4e1---buzujopido.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/valepef.pdf
    • https://daismene.it/file/89832071334.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC64B 16792 bytes
font_01_sfnt_off0000de62.bin
21ea705142926af0acefaec7afe7fb92311dd54274e3ef676291bcd5e2515b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 11396 bytes
font_02_sfnt_off0000f8ac.bin
1efcf9ca401e0714bcbba7b2a398e06a7cb044d95283b3c0fab914a1c3849d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16048 bytes