Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19bae067ed88ec7…

MALICIOUS

PDF

73.8 KB Created: 2021-10-08 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3dd1fbe66702fef5836b5de32a69988c SHA-1: 654a0348acdca306b8b47c0521e68868e0a1c31e SHA-256: f19bae067ed88ec7225f3e88f15a775f8b0ba4030df08b7836d0c7ff05ba1151
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elsekmont.eu/userfiles/file/1968425144.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146573d5ba02---fokoxisatirazatexiligeku.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/botukekelezifetudipik.pdfIn PDF document text
    • http://wami.cc/data/files/bumezudik.pdfIn PDF document text
    • http://hengtongblower.com/d/files/1683760200.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/jebuvexuz.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/6907727000.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/70881147711.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zefale.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gejarotibozaduwuxul.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/wajuz.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/92840684426.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/42213405875.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/15789830229.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/74072817900.pdfIn PDF document text
    • http://drtamerturan.com/file/17985099780.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3s10afkoquplg71f2fl3o5m9k0/78856672905.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/20363081712.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/jisawobupuvafivuzedosuza.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/46438722279.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/zajobotuxugumogejed.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tenovow.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161417febaaa86---wabavonek.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210910015206.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/14653118033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=foods+to+eat+with+gallstonesPDF 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_off0000be0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0F 10488 bytes
SHA-256: 0e00925efc44b00d47ed10530a4e16268bbb35ee165c91495218c4a7e462fc6c
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 17040 bytes
SHA-256: 1456a99636eaaaa3616c15d7eebfd3b2f299b75115cd8ce9912bdab475ae7ee4
font_02_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1