Malicious PDF — malware analysis report

Static analysis result for SHA-256 73acb2c7cffdd54c…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 20:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1cbebfe3621315d303fe367103ae8b5 SHA-1: 6935ca754b11015b7861bacdbc288b8130e33a28 SHA-256: 73acb2c7cffdd54c959ea144ff8ab6bda059e41a3e3a93aaf25729a5c4124663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a814152d200f482c70f0cc64eb3ec991/17932303631.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/98897655086.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160946b6d6866e---93334255409.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be74927d277---seles.pdf
    • http://jnnycc.org/userfiles/file/guwekowuxikemupow.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304c587e9e---8891006196.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f9dfc6f48a3e7aa0b9ecf7b2d5ad6256/mofalelej.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/g3p5mjl1j00jua7e8qt6f5thlc/97827639141.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e15ad3bf---zajigub.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/81465725939.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609226666e7b7---guxiwabunokukosulago.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e3c1ed6017f88e4abefd0a5b17e53a12/suveremetupariparaneb.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/18213365825.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/rigufotu.pdf
    • http://pgnsualumni.com/clients/872691/File/25733290073.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210619192902.pdf
    • http://sungsam.net/userData/board/file/xovudosijuwowapufaz.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608431085c60c---28175444344.pdf
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/91140831499.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/topuvolujixofuv.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080271490f19---821188953.pdf
    • http://nesthomes.in/userfiles/file/xapiwe.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f293a9139b1434f749142065cd915808/53462315618.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093b709c1b50---deditixiteribisetumelu.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/75323746043.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=finding+nemo+cars
    • 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_off0000ff18.bin
5770182009884f93e8c24d3decbfd1cb5a1c2b6a0032d27d9be25fa7d2d7625d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 18672 bytes
font_01_sfnt_off00012e5f.bin
78faa11c2fd76ae35ec0db2ad7383bca4340533d6c4e44401c4502c3d53389b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 10548 bytes
font_02_sfnt_off0001461a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1461A 16792 bytes