Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefbd40c983bb8de…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 15:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f00f8327e4146bb6c10d8426630ff8ec SHA-1: 224827603fcd5a777322052815483168cd67520c SHA-256: aefbd40c983bb8de0bd3663a9d847207febe2af473460782a6c1953c3de92cd4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on disposable or compromised domains, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=undead+slayer+hack+apk PDF link annotation
    • https://matrainagycsalados.hu/userfiles/file/nodoverenudofim.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/45040440989.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/zosuliwulujigedojek.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904062105705929ep9rxcbb6kbk.pdfIn PDF document text
    • http://mosjob.ru/images/file/20548081662.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090920115964.pdfIn PDF document text
    • https://dptech.vn/uploads/files/perajibelunumubobino.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/jibojijofedepukisarij.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/38cb611f7933e94cd4047acec5342955/56010106410.pdfIn PDF document text
    • https://km2804.com/ckupload/files/1288405507.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/saverenadabefepe.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/34929441291.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442b04e9953---tofabexikuvosiboze.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c227f7b2fb---wuxebe.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/57260856405.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/79033695292.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/97504020357.pdfIn PDF document text
    • http://cuiquji.net/d/files/13005415075.pdfIn PDF document text
    • http://cataga.de/beta/files/file/16913190634.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070eec464---nevowojiwijejizuk.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/ramevaradalowisojuloda.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/texajatekova.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/57098070621.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9332d05585d09a424cbabc45e8ab0898/jawilupateliberenugu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/86501310742.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10512 bytes
SHA-256: fe6a83a53d95eefadf64ca01bf4448c014feb2225ef5584ac7b1c16e00ce2fa9
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 18172 bytes
SHA-256: ebcb307a10784c4af17936071364b8e048568ddad8f01a1fd34e894d9c8af436
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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