Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda7a043fc138d02…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 10:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8673788fe4651c90fca4e149e3f81f49 SHA-1: b5fae0f28d1d076fbe3124fd47c11f38ee263205 SHA-256: cda7a043fc138d02c49dcf295d9404c2995657bdefc3756d8810caeb70ef8bb6
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised or disposable domains, designed to trick users into downloading further content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dietmoitangoc68.com/upload/files/16358857238.pdf In PDF document text
    • http://sushiloverca.com/uploads/files/pizojamovosudowusul.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/17901007995.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8h79gaknvc8a1acer5j9oei5s2/didorarupajezawa.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/tesariziperetezexigu.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wofaja.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2ad89ec7eb340b3d5bc652c8f96ef7eb/xuvimedekol.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f44aa930---48011668915.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f7d8f118c8e1a495710873756567899f/lanadiluvagupowev.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202182112512442.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/63630881600.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xoxad.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7d381c4e4c3db739f65ca8ef515d09ae/nufibinuzunovavawosilo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bq05u63ookhpm6dj1c48e88k02/16872943802.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796eb6bee8a---53839442706.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gc5b1ei4sh0uqjf6c4u2qnndau/95655888008.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gr5be1hvocmfk10t602fvskv12/gituwugoxo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/23565992911.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0073347555---fadisarazajuzonozepewed.pdfIn PDF document text
    • http://camwater.org/media/files/sefurobazukatijevi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/41641335094.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/rukigin.pdfIn PDF document text
    • http://suara.ru/img/file/82759051100.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/91027180845.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/29214101402.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c487a24463169e774644d21230fa1cd1/jasanogizufijotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=java+8+features+pdf+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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 10852 bytes
SHA-256: d86314c6f321499a252c157da7b9268fef44cf0619996fc38d4ffbc374b8a88d
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 17688 bytes
SHA-256: db251a51dccdebf7c95553ca6585d67d6169cd3e57c39d474815989b94cd474a
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1