Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca0516f6016df5a…

MALICIOUS

PDF

91.2 KB Created: 2021-07-06 12:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c003032e8ca529b8247c78a4b6d8817 SHA-1: 76a5b9578ed28278cc6c08f370a7f7e0b51ae53f SHA-256: 1ca0516f6016df5a4d8f5000a2d8645785278ca95ac63eb49d63250aa725bbf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://cructi.ru/uplcv?utm_term=how+to+get+running+process+in+linux PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a91a080b---52545642840.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xagesekalog.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/dejodowiraza.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a36628877a37aee00a661d344c406017/28195001722.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97c37ded9---nulusimigovawaxorizesek.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/fizunulofapedar.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/85899431936.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7fa3e1cfc31e66e9d565be618609fd49/lonujibivabezaluwuli.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/81v2igu1gqd3olv3hq6fkougih/sunufubusomom.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/ligazatodapavitosas.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c51e35ab4c1d74a09d00d3efc8b17381/konavevimatat.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d5e83d9a0---3561071285.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tuzarasew.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fubewarikepatovogitolope.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rajajolamuwizotozo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd39f17c0---35935057165.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/u1kpllmfs7tkf86ghmsube65q2/xizijotom.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2k3m1vg4o801belc8mhsa8pn3/ziroxofipojadujijod.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/39837976992.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7a2d245ba8c35ecc740735892088214/tejaputanezagebowasaz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cf6dfbad55c2f5ce9bb68b6e087a9ea/rebulolozabidoxigi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5l16teah3egfr8edi7v4gficu3/tuvozoka.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/mnfafm63qs4t48unp7g1srme6g/dexiwokijo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6570605a3e0b2fc0c55453846e8d/juzarosenu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5c323bbc---zakivamijelivawolowebaxil.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/45426525117.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/05dc345282d7700327f25d0db3614c61/42197912827.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_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10664 bytes
SHA-256: 19427abd677e74f092edf7132c8c7845ad643320fce94211a492c7822ef0753c
font_02_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 18204 bytes
SHA-256: 927924ef72c11711d2d5a83efbce912f3af612d9c9a9df859654ac2392f6d78c

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