Malicious PDF — malware analysis report

Static analysis result for SHA-256 1408b1bca00e1344…

MALICIOUS

PDF

80.1 KB Created: 2021-10-09 16:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95165a397f6a14347beaa881164919f2 SHA-1: f802c07480604e5fd72ba59da1b468cf4babbb6f SHA-256: 1408b1bca00e1344970ac4bdd31d4cc37884be6a031d992814e0164b5144fa3b
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to host malicious content on seemingly legitimate but compromised infrastructure.

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 http://pxmonastery.org/CKEdit/upload/files/difuniparidixagumilil.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/lavibopimokevotuzelaw.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bowokaba.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zupitupataj.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/sozorulopubaziratexa.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/komuwiwebujaje.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/75653635706.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3bd3d6b56e9f8959c58d5cdffda0fcdf/ranipagotuwedimiginipuwe.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/bosubireborubozasakowoluj.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/26421858873.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/97275687402.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/77790254730.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/9034800374.pdfIn PDF document text
    • https://southafricapools.com/contents/files/kotowijopiradetovorus.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/gatotolufuwe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b51788e0b---biledevinorifu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/koguposeroruxagigurotuju.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/nupomukunixivapaluwisuj.pdfIn PDF document text
    • http://186086.com/upload/files/87738230621.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/17884060469.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/witejawuxusoja.pdfIn PDF document text
    • https://hojoairport.com/images/file/gavubozirawanum.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/78f92dcebb4d29bed2bbbe107dfde095/81432871740.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/73211332001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gathering+tools+in+researchPDF 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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 17744 bytes
SHA-256: e20f366a7fa23ad62b6b30b2b1769f08d413e7a778d15cad44d8d41912356254
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10548 bytes
SHA-256: 98d784dcf261de96deca52d73ef204988c1dd397096a44c65d31d1671573dd96
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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