Malicious PDF — malware analysis report

Static analysis result for SHA-256 f627ba2abd3d4716…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 21:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: cfa76102dc9ba69cf0bc7eb8373b98f9 SHA-1: ac0024276c7e24abc09b1205d133824ea03f4639 SHA-256: f627ba2abd3d4716098c722d99642624900eb46d9f779702c67df1dde0588994
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://crysiq.ru/uplcv?utm_term=upsc+prelims+2016+answer+key+pdf PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/akg21p8eppfmh19dbpj0qhr803/mezurawaloxi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/9295710751.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/98502105718.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bupiguzoxa.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/5362620427.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a7a587ddc4ffd887d50c9ac2f171aafd/pebizexiponexeril.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/pinisino.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd499fc433d---virixakevoduxifelefumode.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/95143952687.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/ligaku.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/fuxipapoxixalakegomeki.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094095dbcc13---67555263723.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jajozed.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/gumesoxir.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/pagoxipidenujojevewenugad.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/vubumumuximovifulipa.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30839617218.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/bibed.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe16b046---sanobe.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210825004314.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/popepebifudevuzarin.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/t6u3s9se44qtfas54rjb1olsnj/98958103451.pdfIn PDF document text
    • https://raljob.com/userfiles/file/pufisak.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/70484379998.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 17484 bytes
SHA-256: 868d37aeb42fc8ef2c542246de906549a16b94235a33b8af0994cf18e6990704
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 11324 bytes
SHA-256: a820143f243f3c36df0f458f7193005d8a7a5cb8fa7e1abad758a50c6906c8cb
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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