Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c142a7665eb298d…

MALICIOUS

PDF

76.2 KB Created: 2021-07-24 19:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49af1d53c6a6b6a9f9ec4ec3c41b7630 SHA-1: 6c21e3910f787167247a8470cc7dbd11cd05bdfd SHA-256: 7c142a7665eb298dbf68255dea7212e082c5431fa8accbd2f0d0afbb6a0392ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trimix.bg/UserFiles/File/7436729440.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ed60c551---demif.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c7f42ae6---43508927977.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ebe4908c2ea71af0c31404478365c618/lovifupiluwusajemaxupotis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505171645.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/54630329107.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c909e430122---butogowatawalenaf.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3h7tne7nsogumnrmq6vocoar1/pesovafuwikurorisuzaleniw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e69ea8c13a0---bomorewigedelalefiza.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/73639189108.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/24380388015.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d329a33bd77c9a3164dcb892babae6d1/94228072814.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/tumatelo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jgtnvr0qtdiov01fpilp28imn7/jexosum.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d5ca0cd3b2c7046f55159ca24b256b74/nisuxagegijito.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/liwadozokiruwudugisumegab.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5d953c379---8997750520.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ce2a6717a---pigujerop.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/70217582094.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd094cbc1---93392696019.pdfIn PDF document text
    • http://berbun.com/user_img/file/wetox.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/9426830043.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/44160131419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+chasers+tommy+tenney+ebookPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 10880 bytes
SHA-256: 41e4c765b2a85399b18861db067ba8eac28f2769b5f02b9e11ad85087cd854be
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16864 bytes
SHA-256: ac119c37f8bf83094c96f9afdac7cd00a52731e9e311ca249deec1e0222fe6f1
font_02_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1