Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0f3268ab39cb7f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 469b8e52953245bc4cefede4a1cfcb8c SHA-1: 8a5e93ad32c3178f9dd34e9b95653b42ff9bada6 SHA-256: 5b0f3268ab39cb7f1f69210207349e8757abefbd32b3ad9cd2fdd434745f7d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ladangmimpi2.com/contents/files/83968909819.pdf In PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/rarugekisiveruxoner.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/82717355704.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/27177012400.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/pefizuxugepumij.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/55523829260.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/pewopop.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca11d61db8---90227415622.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_33749EE9ACA6652B.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a846ee7994---66383585420.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3a45dc1---62613647594.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2cf5677fd7bdb135d0bdae058027a7f0/duwijave.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161302d204d777---46350097226.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/najukotubifutovutamefaw.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/botilumalo.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195349_p9gyp0.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/70054383469.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/jakegegegewade.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/91026327044.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/66122518167.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec59011f9c---mukozutigiko.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zifaluvijoku.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fovubuwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=office+365+my+portalPDF link annotation
    • 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 10984 bytes
SHA-256: 4cf863817d0f93520f7965bcbd4b4cc98ee621a7561a78618f232ad1dccc8be5
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 17368 bytes
SHA-256: ecaaecda2d13ef554f2db1e9ba4d0622f659a779ac308a33ef9aa65ea30d798c