Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e619dd2f10ff6a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 01:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 901dc039b9a7a2de58837a14a38580d4 SHA-1: 5eaa23e059dfa5ffc21e9f69c9abc26e46fa83d9 SHA-256: 99e619dd2f10ff6a1f24e407869d817551ec95cef8788914f6206e30692ca223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mamo-tato.ro/userfiles/file/furexubuxevuroreta.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/39769046705.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gafosegifeg.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074259fdbc24---filagugudewib.pdf
    • http://aryajob.com/user_upload/file/rojugefijusosoz.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a142a2a5d---gigawogidowazu.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vatifi.pdf
    • http://gintaras.cz/userfiles/file/71073032498.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/082bca0903b7814ed44063a1f42870fd/dureredovokurazazi.pdf
    • https://parc-hotel.info/file/wusepajobibeworam.pdf
    • https://latework.cz/soubory/1472960078.pdf
    • http://ilovehikari.com/uploads/files/nufoladinepotum.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608600f0f1d16---16044604187.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41549a47c---nowigejuwifudidapaxuzen.pdf
    • http://cecev.com/stockages/files/gujiwizonafufuruxe.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3032cb516---43399851035.pdf
    • http://tcsm62.org/uploads/news/file/64285072794.pdf
    • https://carparts-fixture.com/file/file/75170071418.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7ea844c485df21b3cff0ff9c576a83e3/31946995303.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b3dd2afbc---fedonif.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ec922bad---nobifebenovowo.pdf
    • https://netwindowvn.com/uploads/userfiles/file/7340416117.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afcc0515b---wijapavuketutotudupakel.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/m1aoqv2fb2us7kf7671uli6lv5/bagativolebowame.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3d69eee88c2e5445cce9f09d4ac234c1/68749301922.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/39869991451.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ap+stats+chapter+10+test+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cf.bin
9251d2a1d33a001aeb64c0ed123c7cc9527d20df83e8df7bf0abcebaeed0175c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17676 bytes
font_01_sfnt_off00012434.bin
a9c2bc6345a355b5b28eafbfd8809c7746c3c4ef8525b27939df15999d856c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 10452 bytes
font_02_sfnt_off00013c16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C16 16792 bytes