Malicious PDF — malware analysis report

Static analysis result for SHA-256 049e9583369e3b1e…

MALICIOUS

PDF

76.8 KB Created: 2021-08-20 06:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46fc2d870c5adce26d9e2f59fec168b1 SHA-1: f8775f56a378b133ae36d78f10ce2e1e2e5dfeb9 SHA-256: 049e9583369e3b1eb954d7454637b6930aedf72ac2f4920718d422c887ad4d0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=toro+ss5000+drive+belt+diagram
    • https://alshamiltrading.com/alshamilfiles/file/33604364253.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q9llgglj2d4vbcfjrgrhn16im4/60492307562.pdf
    • http://karlsbach.de/userfiles/files/19291450726.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7bn66jnd6rgscp5g4rqfv79ogh/wasuzezitujew.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/975e404e091afbd57a20eeb53615a537/lutubujifiwowanalazemepa.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5765e39c---65560052394.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/28077732493.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/802c11d23209f4ff7a13df34f62135a9/5704112399.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609986a841e28---rimalozizuxujesiligo.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/68465189787.pdf
    • https://datawire.gr/files/files/nerorenenogenegi.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0ff7e3f67ef34e56c1b20354fc993efb/98642799397.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210816130649.pdf
    • https://humicdp.com/uploads/2021-08-02/images/files/zukuxadada.pdf
    • http://baodieptailor.com/uploads/2021-07-07/images/files/6125076975.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070db1d027d7---13458568980.pdf
    • https://amitadevnani.com/userfiles/file/76903284742.pdf
    • http://legalinet.eu/userfiles/files/tarogoxavulej.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a773d47e9bd004913121bc82fce8de5e/bofomuzogulamiruz.pdf
    • http://sinners-party.de/media/file/78172127527.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecda4b128b---xikibevakixadezo.pdf
    • http://arebiatours.com/uploads/files/84140857711.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c617.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 16792 bytes
font_01_sfnt_off0000de2e.bin
b34c35706d7de34d07b4375a0e7e5fa6ce214f70e339a124669b32285f8ab5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 10912 bytes
font_02_sfnt_off0000f751.bin
0f56b31bb7ff58fc15526bdbd0dfd4c9db620a7ff64f3dae1f8cf99eaad29b76
pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16784 bytes