Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2944fded1e96409…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 14:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39255f147643f06934dc57ad2f96aa2e SHA-1: 59e40b621c5300d384c3d5abcf857168915a5693 SHA-256: a2944fded1e96409872cc3019e262455a77fcde8fe2c34378fb4c5d2ef568071
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://queure.ru/uplcv?utm_term=kruti+dev+font+for+wps+office
    • http://datatech-int.com/userfiles/file/4203373161.pdf
    • https://infoenergie-loire.org/userfiles/file/24652356375.pdf
    • http://karinameal.com/imgdish/files/69571606798.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/56536088806.pdf
    • https://vanchuyenduongsat.vn/upload/files/vasokuzosoj.pdf
    • http://luchetti.it/userfiles/files/fuzemetozanibejokuwut.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8275ade71565ab687457d5227479a0d1/movuzexeveraxegej.pdf
    • https://villanakarin.com/userfiles/files/10172788246.pdf
    • http://aurora-c.jp/files/files/57712493687.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lbrg8ibth2nrftilvhg8vsk56n/fumijo.pdf
    • http://hyunshin.net/userfiles/file/wekezogawonime.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/70553672162.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/fixozoroxunumalevixuk.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c807aa2d57---banujoxizuri.pdf
    • https://foodphotoshop.com/userfiles/files/29247172056.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161427c5a54627---52335209264.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8524a79cc---36785339279.pdf
    • http://nollve.com/img/editor/image/file/20122090108.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/97134160655.pdf
    • https://protraderin.com/userfiles/file/rodonubogokujonalejenobum.pdf
    • http://adwokaci-pila.pl/userfiles/file/junedubezoru.pdf
    • http://www.lnk-creation.fr/upload/file/fipenaj.pdf
    • https://pamukoglu.com/userfiles/file/pedukaxemexefuzi.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917052006788664.pdf
    • http://mishelik.ru/userfiles/file/94252866001.pdf
    • 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_off0000b2fc.bin
3c3f9dedb205e089b43b63d6a1ad1feaaede37767983c90346178c183c190580
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 17548 bytes
font_01_sfnt_off0000e03c.bin
5041d764a287a3f5ffdbb56eba8cac62a5d71af4046440e8d5d7d72183c4eaf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10648 bytes
font_02_sfnt_off0000f8d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes