Malicious PDF — malware analysis report

Static analysis result for SHA-256 555496587e1d8ebf…

MALICIOUS

PDF

78.7 KB Created: 2021-06-27 17:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb47527ca49b401e1a1821d21fdf7c1d SHA-1: 6233b3e99dc705443a8f37907486bac51f76c69f SHA-256: 555496587e1d8ebf0711f81eb9b53e36d176a6563e16d1ee4e9701ff57de7f16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ks2a7k89qu4qpdgv7funktorsf/20318877804.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba484dcccb1---91141914936.pdf
    • https://spark-care.com/userfiles/file/49371266403.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a975ecc869---pidusoto.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607150e350992---3980509650.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/71822277292.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/juwemuneruwisiwomolone.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b94b76151---97480182098.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ff7828080f68e013ff395567ec9d266a/ruzalazalunirafoped.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d2ce1420---vajomumavokigokafo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51fd65f20---54985211368.pdf
    • https://hpsoft.shop/upload/files/xileran.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a36f03a95a68b1b77c494e99404f2ac5/97448174053.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f658d7f2---fuvezovosuso.pdf
    • http://zaun-produzent.de/userfiles/file/17551163581.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d537bd88f02---bozetelagitoriregod.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5f7600f8b08ce0f380708b9eda6131cb/22362171372.pdf
    • http://amadpich.com/userfiles/file/ladikek.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68ed602712---61894518915.pdf
    • http://studioindelicato.com/userfiles/files/tezepixopa.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/345f8b8bde84b6fcc1ad34af6f300a8b/36927084054.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091097303364---jikuxuzojojopuxevaxik.pdf
    • https://1877painters.com/FCKeditor/file/neketivepunegafap.pdf
    • http://614move.com/clients/4890/File/kipapokol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wordscapes+level+2982
    • 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_off0000cf35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16792 bytes
font_01_sfnt_off0000e747.bin
1ac3365db6baa06515e8177c4d252166a475ace97f762d3abce63e990a32794a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 17484 bytes
font_02_sfnt_off000114a5.bin
1d43406a1057a9140490154aefedfcf42a026c86018941f89d22ab5e6b6ee5bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 10768 bytes