Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2faf8026b8da03…

MALICIOUS

PDF

100.1 KB Created: 2021-07-07 18:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79ecbf45e62687502334657ff8f8c2ad SHA-1: 4c854841021b7b826eeeca7a644e463dac43b006 SHA-256: aa2faf8026b8da03456dfe3aa77e711b1f0395b8e95afcef5be2443d2e4e4038
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=our+town+monologue PDF link annotation
    • http://smart-ventures.ch/upload/Editor_Images/files/81610479490.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/25648668273.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/nonuramedenom.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/61720052047.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac906c751f3---3494096189.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/zofoxizi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad827953042---riresajowivun.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jr4tq687k0mg7nm01dka2o9qdp/dutukimiwesulixararuxekow.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/bv8llle7d1a3qrp4935v11bf0d/8289506803.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tvoigjcf1m1ncuk8gb7gomdu6d/xawetizajusas.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991d70b11---gojigol.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/sirudozerofub.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/45333219737.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xedavurumoriwonopajesido.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/94388597656.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dezeduzagakepogok.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/ximid.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e63b3f762ce95f480bf2062748c7e792/pugus.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5660c2bd---31449531324.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e04d9f04---64333661644.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/74846778607.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vn6jadkhruajnklvcfdr6dpha5/samevugudujomide.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f66870361c9aceb8bf42a4c9c7790491/supaporogozafu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/lewijumowegabedulipuzok.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e2f0b3710b677fcb1320898d91a425dc/labaraw.pdfIn PDF document text
    • 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_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 17036 bytes
SHA-256: 339645c79ad44cf7947cad735538a8e70405e3dffd70c1f6fc64a80ce468251c
font_01_sfnt_off00015408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15408 10240 bytes
SHA-256: 9ab1440480fb5b986d589bb0a22f46c63c1d5df00af78d46deac0d18ca6e2f24
font_02_sfnt_off00016b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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