Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8203f290fd8adeb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5330dec304b95bff389e58027329b514 SHA-1: 3e6e9d4a003153ca8053a15459b5d9cf6d534365 SHA-256: a8203f290fd8adeb825105f7224d3ea2c2ed8ec8154bd89dd5462c28d8578f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI links, such as one pointing to 'dream league soccer mod apk 2020', further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=dream+league+soccer+mod+apk+2020 PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2e58b64121cdeb9f209e8fed9e1e5359/31070843071.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/80862183961.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/38962411722.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/2141350210.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nesuvegaragonida.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/renodinoxugigolow.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/26179635948.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87400942621.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lumudonopor.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/44561061075.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/63203345765.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/70801973963.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1f1etkqi91jvvmoog2ha4t1hdp/88266693053.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/26752277809.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/mudutanirutizewobi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zedisuwol.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/72607420528.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/95232700045.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/nuros.pdfIn PDF document text
    • http://normel.org/files/upload/file/luwejugisipipasadoradaz.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xamiwigutig.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cad462d19a---janowona.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631736534813701887.pdfIn PDF document text
    • https://value.ae/userfiles/file/6533893679.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/5760568001.pdfIn PDF document text
    • 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16504 bytes
SHA-256: d73cb6ae6595e12062f849f98fe83b54fd36731be12b21320f27901c7cafa055
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11000 bytes
SHA-256: e159f76f0ee338c774018885a0fc537182e4fa9105a91f68aa6e951bd1ad61f3
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1