Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe3d06a3a38e8cb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 14:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c089c2450e79f18b455e8631f0927c82 SHA-1: ca16379fde9af69dbe63c67982e0a412786463dd SHA-256: afe3d06a3a38e8cb4012cf8652fb73a65e70556c89f6a305aaaada61746c41ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zrdb-drogbud.pl/Upload/file/74450182846.pdf In PDF document text
    • https://gizaviation.com/uploads/files/japobaxaj.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/85301971450.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jariloponomegojowumiv.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/wogawuzewomerokasopaga.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/tekijejelazezuluxoresu.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/fujajumelenenotuwez.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/gobetefovaxusasatekoril.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec68bb7410---8964811819.pdfIn PDF document text
    • http://baoveantam.org/upload/files/wudevapawezovenanovo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jbjcnccegvh2g1h8tu0sn100qv/sofopetupaki.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/5400909246.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/56252263071.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/81043717928.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/32903957935.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/malomegolekinoxenudofimo.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/81033803352.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613966744a4c4---19946268627.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/926ff194b8001138876bc32025a400a6/21047043626.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_E4CD730BAA9FA82A.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/31931445816.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143be23d902a---tatajalobunavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+status+maker+app+downloadPDF 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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 18236 bytes
SHA-256: 183db583d78bc3bdddd6bd3e536820bcb1ee1d1dcbc480ac7ef610a62b4779fd
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 10792 bytes
SHA-256: 0bddbf8b796c44b0db3995d7cf3f32098087b0442e02a627e432190c315b3e54