Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8d49b6533e9f7…

MALICIOUS

PDF

84.0 KB Created: 2021-08-30 16:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f96cfae68c8e6a8100d83780c78f86d1 SHA-1: 19848e52993ba05c1e22f84c4618c4d616b8d441 SHA-256: 77c8d49b6533e9f73119fc85236d9a0a3415c21fea947bf60c5df4f17f4b4f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other potentially malicious URLs. The PDF structure and embedded links suggest it's designed to redirect users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e279a2ae04---pebekakesu.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c07fa29c2b9482c00191d430af9ab960/tofakinumuzilerig.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/26245876312.pdfIn PDF document text
    • https://edgecs.com/documents/demujo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607836c3c63b1---74139552144.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/71109394851.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5g1g683lfj393e8venq51b0ha6/41247642366.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/kilisofipufimugipumelofin.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/24137593657.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/zufetiwepedogob.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/85316813727.pdfIn PDF document text
    • https://equalland.com/uploads/File/jewax.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghje50rtvt9mtu9ivkdu3sl164/23369708894.pdfIn PDF document text
    • http://abworder.com/uploads/files/zusujirulorofasokuxaj.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c179ead2563---fubuk.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/lunupezipotomuvefavusi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/493c4ba6798de39f26c720b70a410563/gapivedakuxawe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/41946cd54725d1e45445a7e13a8f5628/82390867680.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/mixagozataxuletikagi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d0a8360ab52c5d0aa091ad9a4ba7171f/57199388438.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/67289401677.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/30tujel3ij2381d6996j6n0o3b/64804080668.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/busoretidosapalu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6f251229ba393eaa70f0b28b8aba8ef9/pevuvosebot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=good+things+do+happen+quotesPDF link annotation
    • 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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 17632 bytes
SHA-256: 77bdc5c33f89068b9256bbb8d749849ce64644ec1cd91b33843823d3c1c49dee
font_01_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 10812 bytes
SHA-256: fc1fa556028fab34c2e40b1227ac6c787b4010d3a75a50395246d13b4b99e6f8
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1