Malicious PDF — malware analysis report

Static analysis result for SHA-256 db07f2a2f699df18…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 04:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b2a4919d89ca01896b6897a32390dfb SHA-1: ba0f551b0ce1d17ec17e36b7bb484607e2dbc00f SHA-256: db07f2a2f699df18dcfa1254a9ae2f42fb2aa7995431536422264940a2b646aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to termination notices and deadlines, suggesting a social engineering lure. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, likely serving as download locations for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=sample+letter+for+termination+of+mobile+services PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824dbbc9545---tukudiwaw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c7b19f4f1cba9a2b47b390473948839b/9153981433.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/98975423834.pdfIn PDF document text
    • http://armanetti.com/images/72232553166.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd8f548ef3---37785474226.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wilajebemelabenarinuru.pdfIn PDF document text
    • http://mamam.by/upload/File/file/99614750310.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/7349567798.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ecdd6763---28767419514.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3212d24c---98347718853.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4eb11e13---jiravagufiwavezabujeb.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/butapejawapuvo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a52a4de55---31898342764.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/gusikedosira.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c14e3ee0a---58799743761.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc85ad225---99053904321.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/77694697309.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3c2c3f30da59ca21c0363f2e58b78324/25860862818.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nunalubuwawalabopexokexeg.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07328dc73---25033163443.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/vojogasevino.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/43454721686.pdfIn PDF document text
    • https://samudra99.com/contents//files/13850565195.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/35150998704.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_off00010013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 10924 bytes
SHA-256: a860790376ef89b8cdeac70b5983463cdec9c5b1e22a79105d4fbfa1cbe56836
font_01_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 17076 bytes
SHA-256: 78a628e155661772e31639ced3ee4c911c8a74997b6f4541396a12880408af1e
font_02_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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