Malicious PDF — malware analysis report

Static analysis result for SHA-256 349136c1264512b9…

MALICIOUS

PDF

79.9 KB Created: 2021-10-09 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 634f9aaa5970f7c986b4886cf402b273 SHA-1: 1f71d62985096ea82aca2db0c9cffe5c5896001b SHA-256: 349136c1264512b921826fc0a63181b7cad8b536aef23ed28e5c8ce220b80e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=table+for+a+square+root+function PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/pesozinekazoxipaviredim.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/61537438287.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/4995890412.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/9856405284.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/vexupavinomujunolaz.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/kadaxipavumajogol.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a9a942fc4d---44784283251.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20211001025959.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/3204100799.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/61555560150.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/13990948955.pdfIn PDF document text
    • https://edex.co/userfiles/files/31855252579.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/76943295831.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/72273095293.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/32489359324.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/jorijaje.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/90379703965.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/tobetujebajejoname.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/nefitewenolamixomut.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalofonomip.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dbb52fc7---dukagebad.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/040150002140.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sawidazarakenewejazujiju.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/lalisitobibunivogad.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a44992a9355d4653fa89b3b84f745468/31237985858.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/pajij.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sasekiganomuli.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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 18592 bytes
SHA-256: 7575497551fd1566b680dd467c2e6d654f34f53e08a451b038c85f884cb19566
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 10676 bytes
SHA-256: b5d80d0c01829f6be7a178366e78e11cc7c3dbaf9872c235479fdb2c4493f0e2

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