Malicious PDF — malware analysis report

Static analysis result for SHA-256 906662f47a91fdca…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 12:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe2c3197c9484a20b47da25a880eb966 SHA-1: a456b3db33b366d16692d43ecf960c69b58e1796 SHA-256: 906662f47a91fdca579bb55bc20a615f1fb8a4b70f46f4da1d13747f91e5ae97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the heuristics and numerous URLs indicate a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://mjsolankifoundation.com/fck/imagesfile/jagezi.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacda0effc6---zamikuxatuxekuda.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/45705221368.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/728452490.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/22366208560.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2kfu1nsvmmrbp7ukjtig9tq411/11175096629.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/galugijidusaxoni.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609949ac41004---5110215079.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8db587f6a---20394039163.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60e82694d5144.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42c7048d63dd6094f18f52070a2206d5/8223411002.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69618a0416---62429430861.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/98c04a09d462994acd1dda6a656a89d8/70037027452.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3cb6vt13spu6bmd1lj67tgu42/newuzedigusexebotif.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sakebotaludabow.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/f5lupodkn9b1a8dagjk86e4cea/falojuwoxuxudokov.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/fakelidupajoxiwog.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/revulapelaku.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb61eec90f1---titunurixab.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ab7e003feef5745393358a2b047c3ab9/10317608458.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be87caa1e1fc93b1404ab0cda19bf8fa/dofazuzogexagajudub.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/lipoxefuriguvapajivifu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608514b291279---84643247469.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/govunixatoxetobipuxojapu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/01db6b03c2b227f3a25ec54f43225290/vipadis.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd97cd0f585---dopinajux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introverted+leaders+examplesPDF 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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16640 bytes
SHA-256: bf6418fc7a7bb7ef5dd3e0cdc20251ba420a86b9dda1df988789aa95360d2e91
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 10580 bytes
SHA-256: 1967a26c27f2bfecff0d15d636f0e1ca24850f8742c60d7c95dcbeb33cf6f255

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