Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfcfb58e659eaa3…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 00:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27144b571337cfc056a37983b35f4c0b SHA-1: 695547ed6bf8e8f6b3dd1bc7fb22cc27da87edfe SHA-256: 3bfcfb58e659eaa3dc6fd0140927e4c0a762b204a275ff15a3d4f008ff0d40f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure suggests it's intended to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9df1kfrc997e1emob56vl8nhfm/sorifeveziz.pdf
    • http://otvorene-srdce.sk/userfiles/file/pexuxi.pdf
    • http://riskhedgetech.com/uploaded/file/410647735609c4d30bf861.pdf
    • http://enjoy.sk/editor_uploads/system/files/5926498841.pdf
    • https://memoservicesrl.it/file/pexinug.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c493a240---vudab.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/aef5412c8c8c485ea88410ea475e7a5f/wisemaridagixipajix.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/kezena.pdf
    • http://www.zywawiara.pl/pliki/92324174309.pdf
    • http://aj-logistics.com/stock/userfiles/file/61038846820.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2cb4bdd4c7c1f1f2955e086212ff76ee/rixitekibisibe.pdf
    • http://vimbark.sk/editor_uploads/files/wekorikejawegetopodip.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a4a448d2---bujubezezitisisomidiresa.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081d42b6a325---kiwexo.pdf
    • https://lasanisports.com/files/bogaweva.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f6058a0---loforimebefoxojawubodi.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/88449a71086e4a63a21661115bd2664a/luzexawipofapikujek.pdf
    • https://moto-trend.cz/public/files/fck/file/44865043855.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cc0e5e17---bawimiwa.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rbobf538d9aiu6tblqqpi2ut9a/bofupezuwo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/peselr57tuhioq1je363ttlq64/48943487740.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/af073f9a52866581ecab96e4a37d35ef/vureji.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c23b445dd---xizinidixaribolun.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607540be350e3---70965380679.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e447c01030---bulakigojutipezewid.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6gdr1euv6k648jnb6e1fffefbc/44121253746.pdf
    • https://mecaniquekd.ca/upload/file/jolefilekuwavefedizimit.pdf
    • https://karinbentum.nl/uploads/file/68435513892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mmr+vaccine+and+autism
    • 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_off0000ec3f.bin
7a3c968ab6b24f63edf5d607909e2253bbedbe761efff929e106ab49a49d7f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16912 bytes
font_01_sfnt_off00011840.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 16792 bytes
font_02_sfnt_off00013057.bin
5cae240bfa1017ce561604d4997f58493864972fa2f79bb5e5f2263637824298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 10524 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.