Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2fb92ae1ff4f01…

MALICIOUS

PDF

135.9 KB Created: 2021-07-02 05:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4e5cb7e7f0c4054668c9e1c57ad221e SHA-1: 59c6f4e94460b07b1617c419ff74473a59373558 SHA-256: 8f2fb92ae1ff4f01f11182a7fdc02e1569cae9a5ae7e407735c4905d1db74534
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or exploitation. The primary attack vector appears to be directing users to these compromised URLs, which likely serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5846

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160accba4cd97e---kuwozasadusasawelumitogik.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8eecee51---52783648146.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/matoropaxavusopemevinanu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d6aa0c863e16b795df3354ce8f36673c/34509776329.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e357a8b2---54591453252.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923d040d6a2---kafolubesulimijosus.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f575a97fe5c8bb1cdf5bd08e543791b8/povulon.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/26416353288.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/64723662646.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609437a82bd16---puzativoxikabixaro.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fbc41d98---40572358235.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/witejojeweg.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/e4l29qnl8pp2gvo2pucuqcko3i/13881131555.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/33163951820.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c918b8c35c---venifunozuxoner.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f151c46640---82744321337.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/15270757769.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7f12d374---buxas.pdfIn PDF document text
    • http://arslanemlak.com/E/file/8811205342.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/meviwegij.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/newavajaxevixavev.pdfIn PDF document text
    • http://614move.com/clients/4890/File/57513392500.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/24b6e9896b42f5265766e0f2443e2315/sibobuwotojadodizekarozem.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/423dc793c3601c1f56402d624d1e532e/febivijaxavozotowug.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/58ed9d1af197c4e83bf8d8ba2db7d0cb/bofab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rules+for+oxidation+statesPDF link annotation
    • 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_off0001f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2BB 10596 bytes
SHA-256: b2bde6a01f7d16a2ddaf23c5ed84ce0cb22b4a1a87880e6ffecbb378a40867b7
font_01_sfnt_off00020b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1