Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c41de082d36265e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 14:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4807492414cfeace6af9565b2750bde0 SHA-1: bdd166e74edaebc0553c0e9c4112543a8f6c63b4 SHA-256: 7c41de082d36265e8c5fef481c7629d69b6457a3dce31f1e44b64e92ca7c79ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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://resortweeks.pro/userfiles/file/bigujikagek.pdf In PDF document text
    • http://k-souz.com/userfiles/file/komageruzodukazukagetotu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/91689975503.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/adm9j4asb4mtciomp5msp8jlnq/bunefafulanovav.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/tixekapatanazivobovud.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1fd59f49---zapakefonezemitij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ba413669d---wabikigikoxemazaba.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-9/20210809082744945686.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/pudezosovakatukadaduwozon.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddf1a1f75---34889217078.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d13bb816---fijerob.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xosakevijuzedizibiruseku.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bd74804f---39017759809.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210815184659.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/27943243525.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/nupisiruxisilu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/06ee5540cae72bbe48279b4a7536f844/50732062176.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c987a4291b---boguwadaxukobaxanopigubu.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/75775099974.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7f9b14d4---88389038984.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2ee67a58cdee3e82c0d0220a65e8ef9d/12209682935.pdfIn PDF document text
    • http://efrex.cz/files/file/73665186020.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a21d08ea70---witibulekaluwivasodasiv.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/74868988040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=al+quran+pdf+apkPDF 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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10200 bytes
SHA-256: 5ff9933c2d4751694114046291dbfd033c526e5d1cba888dad905b57a583d947
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16952 bytes
SHA-256: 5c3aadbd8b7a4b0383b71ebf55f3bb3964bea6d691efc3c0c37bf5d028b52d53

Open this report in the interactive analyzer, or submit your own file for analysis.