Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c5563b54d13073…

MALICIOUS

PDF

88.9 KB Created: 2021-09-21 02:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aff5f90ca9f1215905bb5d05b7a0912d SHA-1: 9944e142732394260d6b1265ab74a9ee06053dbc SHA-256: a9c5563b54d13073add090fc945f344f0f7c65dd834b7df67e2ef98572a6849f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites 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 phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8mh2nc4plp9susl314kqqjuj1o/kunenawajanow.pdf In PDF document text
    • http://giasuthienphuc.com/Images_upload/files/64939927911.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/6657063022.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5qo9uenuue5jp0mccfnq6bohq1/vojasorofipixokujiz.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/83037751314.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/dufamisazebebopijadojalib.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jewuzirujozazuwipi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/sewovutejo.pdfIn PDF document text
    • http://kvrhousing.com/uploads/tibezetovoxiwiwi.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/xijazobutumujalujogi.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/63015571787.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/marewunefokojafu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a771697aa---zeneb.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1bea93a8---48995723703.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/lobukig.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/89814605543.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4221a9a0---nasuzibesimededorutadi.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/968175d8a945661d791dd35b17ce6edb.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/60913667418.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/89209415081.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/79329081788.pdfIn PDF document text
    • https://asi-filter.pl/files/file/mizukilizegujiziwen.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16313896721206647738.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/62822317974.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/10358477523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+liquid+crystal+gameshark+codesPDF 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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11268 bytes
SHA-256: 64ed79beb12585d948cf2925aebccf87d4a6fd5c426655acfaa4edd9d8efc00e
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 18740 bytes
SHA-256: 797a14dafb2c34b6f44af7d2cc747538905a7aaee33aa3ccf3aa705379c06c05
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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