Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ced0008314daa6…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d65ace824bf71aa13def6d9ec6a92ae SHA-1: 9c5c6723f433d845759b94c989fa5e4e9d509922 SHA-256: 51ced0008314daa6b80223c81203016918184db2d1397f937c62244aef688452
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous links pointing to potentially compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=1+spot+pro+manual PDF link annotation
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e26206d2c---nisasadevugoxefawebe.pdfIn PDF document text
    • http://palami.by/images/file/79417011452.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/zanatilugafulusi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/jidenuveduwar.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c160d73a1b067cfce577f0737f976a8d/40752744360.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/zexosofikikadiz.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zikizumubuwusod.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7d937d660---38224694027.pdfIn PDF document text
    • https://telenovella-bg.com/files/dediberiven.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/h27qu5r60q46hi3l5u4fcn3kh2/41086811220.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/17783630667.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976fdbb680---voxazivibagel.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/degijolakogera.pdfIn PDF document text
    • https://windsbs.biz/files/file/6912329194.pdfIn PDF document text
    • https://petala.gr/userfiles/file/rubizobusivozuxotabukumu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62ef64334---podex.pdfIn PDF document text
    • http://teplospectr.ru/images/files/11549463625.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/tuvaxitexaragogi.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081916081870554.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b9b18f7b---rajejo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wegaxenebasagirisatove.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/11251909669.pdfIn PDF document text
    • http://retrofotr.cz/files/file/xebip.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/25655237282.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/30a033116250662395bf15bcc0161095/99362314822.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 20596 bytes
SHA-256: 7f24ed8f87699a958f7008c067fa9b6245a691916883eef247804c41a62bf17a
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10244 bytes
SHA-256: 01e3e53e76aa9ffecea7e1b646761137b68e2ab9548c0dd5003656e4e58a1baa