Malicious PDF — malware analysis report

Static analysis result for SHA-256 f426d7e54cec2a15…

MALICIOUS

PDF

118.0 KB Created: 2021-09-05 20:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79f3334c7b7febc4ea16dd8a9eb0c005 SHA-1: 7d780b17e5aa764646147b48e40a95470a87efec SHA-256: f426d7e54cec2a1518df1dd162b797953cc2e10482b4c53d14dd22bd3c739c89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. This indicates the file is likely part of a link farm designed to redirect users to malicious content, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=navarre+bible+genesis+pdf PDF link annotation
    • https://bandotrading.com/uploads/file/90530117736.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/giroforejavixerorubelak.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/2059781357.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/56d55mtij2orp5gnvhdmq0fq89/45335542212.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a70210b04---feledudiwiwifanovo.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/rurobizevabamu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/43087322672.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/wevofovofuzokavimezo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/xejoxawowupibijef.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/kubiza.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4970c869---16636876189.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dbd13ae2944c7c127d9cd622056f6788/molup.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/63572608639.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sirolu.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/96668186618.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/bomikixivemo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec52c429024---30294307776.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/62487646376.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/868d7e67f45754e4e033694204f3631b/pajutavekososafijugotedu.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/lazuvedexafisud.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94e1b9bfa---nigozega.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08e06f08b---33788664098.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/mokam.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/58161381765.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/85071009348.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_off000161e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E3 10640 bytes
SHA-256: d3f66f18c253cb72c8847e0e23b08bf14fdbb9ff69e940c91555cca23a410331
font_01_sfnt_off000179e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E6 20956 bytes
SHA-256: e3d9da6449a6935a595e507eb510675f7e0d82f980d5592b68786cb61fd499a0
font_02_sfnt_off0001b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1