Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff21193c66c7909…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 02:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 346dbc661f9cabd3b063a7b8249ae1be SHA-1: aefec9e28a9e66eaabb031eff268222c2d0137c3 SHA-256: 0ff21193c66c790975e4c8c317922cfe9eaa1ca006714a62036bd9f75178fc85
204 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=stick+war+mod+apk+hack PDF link annotation
    • http://ave-france.com/pics/files/jamedeposabova.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0f606578---14588292740.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/56796957636.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/33473106283.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jutoxovevuzimejexesukopi.pdfIn PDF document text
    • https://jjpremiers.com/files/84010786623.pdfIn PDF document text
    • http://freewest.at/sirajexonejunirej.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa99d9ea4---gomopitineripudepiri.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/84260003204.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jigodumakelozeweloz.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/72005714306.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6e13568a---3583057452.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109071942075721.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/25523134885.pdfIn PDF document text
    • http://air-con.ru/upload/files/magefavemupavuxipesusapi.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82070660647.pdfIn PDF document text
    • http://dr-temt.ru/images/file/898790266.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pusolazutodopazuk.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/89984517604.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/xepazarenakupobew.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/25320894259.pdfIn PDF document text
    • http://gibisch.org/files/files/74003473246.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158a5e168---jigemigunoga.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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10580 bytes
SHA-256: 04a118853d7b2171bf32d82221a9ac6fb4b22e14bc912b96c71bd94e870d035f
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 17288 bytes
SHA-256: da152bd7c5a60984fa3b833d4ef35c20db40b87274198b4f0be154e0abf8e24f

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