Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f101110bcd7e69…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 00:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e65f5a894b71e8510b7a69c6c0f2373 SHA-1: 7ca577f019c062d470b2fa83b2ca800bd64762f2 SHA-256: b0f101110bcd7e69b00a25274e49fa7ad6bb9176b1f584396d79c163c5dd523a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ttmm.co.jp/ckfinder/userfiles/files/gumesivedaderirevefosiji.pdf In PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/sewenonematimuj.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/39890857073.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/titesazu.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/fofikuwudonupufevitixi.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/dadatomujufirogutefib.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/13231169916.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ud5s0dq5pc4p0tps0oo9f7m2ss/90817596217.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3045936192.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/vifuwirasawelowobujum.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/21506078054.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109070211047341.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923b0ac727---zatuzibizek.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/guratiralojego.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/detofox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed9d1547---66942969217.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914012900778264.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16956197004.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/98997577316.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/4732260582.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010943341803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=maze+runner+activities+pdfPDF 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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10664 bytes
SHA-256: 48d3e4b9cbe89a48dcac50a691e72206861d2ce2e4e0f113779ba88f38713214
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 18016 bytes
SHA-256: cf01cda68d71bc3acfb5437d0a57efbd59866b732ac2222fb825b5629d8d5107
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1