Malicious PDF — malware analysis report

Static analysis result for SHA-256 e183931d83df3ae2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 17:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1746070637991252bf8cfee6f285b5b SHA-1: 010a354b41a75446149f18a8aa322bd8a090de87 SHA-256: e183931d83df3ae2747ddb90dd3e4498ac39faa3cad7cd6ad44294cc751e99d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rowerowaszkola.pl/imgturysta/files/63824256570.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ba40a8c5---48091012157.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/21499581958.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/goniximowam.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/jozidok.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/070516341191.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be1461627---46103105846.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/37361602464.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd28604cd---85630161104.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/51168317819.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903183330253508.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/6144652518.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/95021076069.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/17876736936.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1a0458f8a37284942f9843d28a9cf0d9/rogixibudobenuka.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dajawi.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/zobiredotabopelategiwov.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/38920888115.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/29228545109.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/61655329995.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pepolefirekinuvidufa.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/19704335837.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pinokopofawi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e6da0729---32513628642.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/nemagotok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wr3d+wwe+2k17PDF 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 18020 bytes
SHA-256: 4aba2c75fe319e4ba70f17beb21da49100f12efec3d286d9b1cc7913d0415c1d
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10016 bytes
SHA-256: 39dca9f6feb2a8d18e2753482df9aec18a812ffaa0dde38b0548770cf09b3766
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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