Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1847bfa1bc51b5b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-22 14:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87338a09b152311bec3dca35c29543ec SHA-1: 50dfa255f8e798eae43580b591297466a707c0a0 SHA-256: c1847bfa1bc51b5b368851aa42f3539760ca0e60de0447356baf5ee66a969da8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further suggests a phishing or malware distribution attempt. The embedded URLs and the overall structure indicate an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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://labelmarket.eu/data/file/rumirivutavibu.pdf In PDF document text
    • http://maychamsocda.vn/images/userfiles/file/fogojotoka.pdfIn PDF document text
    • http://glbtrader.com/userfiles/file/59117732527.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rabubalugi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f774828---5530786643.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/40196777596.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_133602.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/84524580629.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/peralivubuduju.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/13980658055.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gajojabif.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161403807d111b---24113179760.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xuzusuzikotanejefadixe.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/lizodarejasi.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/rilakudarexozodedes.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b0d6801f---37705160138.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wunutufesuv.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/roluf.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kavivakanadevugapitugax.pdfIn PDF document text
    • http://idcla.net/upload/files/dovop.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/87580395382.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/litudad.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/wizamenidenigumeradog.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/221ec98c30e2c6214d1019ce5673c3f2/37333111398.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xevuwesasomafegidokikem.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/giwapinaguxipiwimagerivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+5+apk+for+pc+free+downloadPDF 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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 19140 bytes
SHA-256: 935b44ce672a14a707a139a3d794f22a093e29720712a05190b7ee86601622c2
font_02_sfnt_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10704 bytes
SHA-256: 8341154390d5a03738a955465f04c202b547dbf762c565ca9866dc84d5e16fa6

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