Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74629de1a1134e8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 12:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 85506aa046e6698035ba6814f8488ae4 SHA-1: 68c670a7b7eb59c34aa2995c7e25692fac913be4 SHA-256: d74629de1a1134e849698f1f3aa6bdb2bded48976d86ad99c4dcb98c6a12f93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goldmenu.com/userfiles/file/siravirisimerizokasise.pdf In PDF document text
    • http://stroyindustry.com/userfiles/file/xowetamovuzejusokobikam.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8c7556bbd2b403f67630bff713c120c1/9030307171.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613441ab4695a---lexinirivowevipuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb72a993---nipuwewiresuxo.pdfIn PDF document text
    • https://kaparatt.com/images/File/gapar.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/93206763781.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/63644879239.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fa15c193---gexomiwavewesagaw.pdfIn PDF document text
    • https://mimpidia.com/contents/files/80553572004.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fulamipuponuvurusa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/581ea30508db4ea220f37f137f67bdf8/37403595867.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/woxivones.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tapigisutinidozapa.pdfIn PDF document text
    • http://kd-council.com/upfile/files/fexemesigojexupidixubeluk.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/71710956793.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/sibajobibujatadaf.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/90166333519.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rujegupefover.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lazulelufepidoxix.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/42629664482.pdfIn PDF document text
    • http://skupka54.ru/upload/m/duwetoxideponur.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0nrd8pfa1qrdoftbrqrf4hh7i2/zufafog.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rititipuvupofoseziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+go+premium+apkPDF 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_off0000bf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 18720 bytes
SHA-256: 0144f82871d31b0c3613443d20b8a25096323b906d941b80bb3395654d8a2ae1
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10476 bytes
SHA-256: f9aab3f701f95be14560b2cea97491d2e30c6ecc0a1d31fa1e3f8be6804c5022
font_02_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1