Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78af23064025043…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 07:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9ec736a726a9f02b39d4d7f7bd53bf4f SHA-1: 8936eb5e606529aa77a5d5d7c5d4ec1a87a44027 SHA-256: e78af23064025043eba3a57d5c2cf5c941327caf4f6a02183e3c5d53ba14d266
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://fueandhair.com/userfiles/files/1337589148.pdf In PDF document text
    • https://lapalettedesarts.fr/gestion/file/40393084972.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/9c1a0fd0c74f2e23d4c8f6d3e8005e68/96957681117.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609797d9d7059---5881913134.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/teteronozowed.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/81289111766.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5908380461.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/72624691683.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210702_955BF155C8C95050.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609847374df45---forizirufikakokof.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071919b911c6---fiwutageku.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/gonefu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/50826962457.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859c916db84---komosarivuxe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b382db9f70---belulediruxuwanarefanime.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e6139aba---tuduxonow.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/48687058119.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/warixerupuvutusir.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/45530968509.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e603399b---lekuwomedawid.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/24263573565.pdfIn PDF document text
    • https://htchninc.com/d/files/dagomugovirifolebim.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2357312ef---rapuropopixipo.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/2656598402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=biotek+plate+washer+elx50+manualPDF 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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16992 bytes
SHA-256: 5865f372180935c1bb11fd8fc26bf5c5b51c3141d3102f9f92ba79d8f46ef430
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 11204 bytes
SHA-256: 0fc63dba7e007ed006c397aea592388392af63f82c4b9046caa58dfd627302e5