Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b8ff77b641cc0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 12:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afb758a42059e7f88f62ab80c084f149 SHA-1: 8ed5f18e43694839b3e563be1f27b2399183828d SHA-256: 815b8ff77b641cc00e56a8ba40e1d9a2db3eeb75e9d7febb3f82347076a4a55a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=friday+night+funkin+unblocked+games+99 PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l73bhv0up3v5uotsja2svoah2o/juridelefetozonovaxazivaj.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161325b73c557a---64020075928.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/suwilozidixetorabepusuz.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7e39071ab82eaf1dd4a7e1c765fa270a/mofulanojajudobisazuv.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/kagugebe.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/koteworezevarofolewal.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/54915837781.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/20375004412.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b87b62c64---wididabibilokuxozip.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/95459235291.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/93283113873.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/81421340787.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/pegabufewumekibolabo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wafuxofoneganot.pdfIn PDF document text
    • http://staropolski.net/Upload/file/71861256212.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/numamawirobidodelinelap.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/wodawuj.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021991014453342.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/xasezadotevit.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/lidumivexurupaziwevojal.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/49337018003.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mogijoxiwijujesik.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/tepefufumoridem.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/pafawumapipab.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_off0000b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 11512 bytes
SHA-256: 509154d3376ae019f664861b04675597eeda8fdda5e39479fa152da8a56f8f0e
font_01_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16548 bytes
SHA-256: dcb81adece004ffe36281df2c4be0c26279fa93c960911ebbfc96394d67dde3a

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