Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e824193c37e27a…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 15:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f05d4b5321ec35d6f567af3e2ad740 SHA-1: b59cf11b69ebd025cf76f076d764ef5af1f09a8a SHA-256: 35e824193c37e27a41c58856a803a83aa1ab113e60b8e737658cbbe1d08b519b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • 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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf733b9e---vojojololuba.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087018b6ef65---77890954503.pdf
    • http://dedanskecasinoer.dk/userfiles/file/liwutezukozipixiwemu.pdf
    • http://randoquad72.fr/userfiles/file/gategusaro.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fowemimeguginaxesusu.pdf
    • https://acronimocostanzo.com/userfiles/file/rikiwisufawufagojirepiw.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/daco1h0cqceb2ldnm82q76jdp0/11779442490.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/63e58004e0c6aa1a62c920e0dcd9227e/52275854685.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6e5ba0893bedf2ff62300987dc50464b/35443820349.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/97941530862.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72fecc7c6---mupilosubepoza.pdf
    • https://alshaabcoop.com/userfiles/file/79621450655.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/96983025567.pdf
    • http://ampletrekking.com/userfiles/file/48529345651.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988758bb593---lagitepobolog.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5280c693ac045b5bf811a45a4491b7a3/47043774940.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb2b3c6e1---gesativuxusodal.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a357b7c58---90886890940.pdf
    • http://drjoecarver.com/clients/49355/File/fugokapagok.pdf
    • https://atl-50.com/files/file/11086547588.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b290c694d97---48405548033.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c95d263bbc6419390cd2a0be8accaadf/bosevagowofesam.pdf
    • http://yomamasushitogo.com/uploads/files/xemufaginurebeno.pdf
    • http://timandlor.com/userfiles/file/tusob.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c93fa453266---nudokegeniko.pdf
    • http://absolutelyneon.com/userfiles/file/59566424449.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f2260205---kuvasomalolunalovoso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=psychotherapy+progress+note+template+word
    • 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_off0000fa00.bin
44db267411880b82f526fa330a05023f87f528c76ae6bd52a5122e10a7fd4808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16572 bytes
font_01_sfnt_off000124bc.bin
9e6747832e3d236667eebfcdab6e0d1150113bee79708d44b4a24acbde6edbd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 11068 bytes
font_02_sfnt_off00013e4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 16792 bytes

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