Malicious PDF — malware analysis report

Static analysis result for SHA-256 033f6dda72ee074b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 07:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd6d6b18a4f3134fe1f1a354846fec31 SHA-1: 507fedba3f6cad46753cddb597223bc7b360f29a SHA-256: 033f6dda72ee074bdafca3faa47598063582a3ca0ac40216602f5898343e9b25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=c+channel+sizes+pdf PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ca78e4d1---lawerovolawegezibuv.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/91458426372.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/89675248324.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/toxebosutapopijuroxa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0053ba5b2a---99902307718.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/10547231503.pdfIn PDF document text
    • https://miet.hu/kepek/64441306262.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///modegimag.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3db5d0d5---29335775865.pdfIn PDF document text
    • http://calisnt.com/uploads/files/safukazofemanojixax.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/dajep.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/jazudowiletefetelatow.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/rofojifanefazupemovax.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/famonu.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/71074299750.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210627081944701.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/30738421318.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b8c6f2a9ba02224726c96a550a374b96/7423106771.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d76d11e27---wufugowupikuzu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/32052431572.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zinodevagugofel.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb98dfce038---posusolo.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_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 10488 bytes
SHA-256: 4467cd3b46460296449824b1a65faa73925896bc7f77cff1d8c717f66db067dd
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16368 bytes
SHA-256: 2102dd6a8534a339013c7cbead3340f33771e81ca41957f0ec54064f37a90c07