Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a3b920d884f8bf…

MALICIOUS

PDF

106.7 KB Created: 2021-09-01 23:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e997dec54a4dd65d39999c99f58c6c8 SHA-1: aa0bdb05c10aee69afb436fd333b0232666f0106 SHA-256: 78a3b920d884f8bf8fdf634f6610266cdab911f02f3a7982f2df8454b09c8a1a
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users into downloading further malicious content or phishing for credentials. The presence of multiple external URIs and a link farm heuristic strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://flightshop.jp/images/blog/file/58413752315.pdf In PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/rimoforojev.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/notopuwa.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/50554773137.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eb05ff55c0223ff19180f079c32a6096/25884916713.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/88165245946.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/sujususus.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/61426211539.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/96098332412.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/40635693577.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4eoas8ha7nqd351rqr8ntpum3b/nefiwobo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16086d215c2bf4---83149658043.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9975da18---velibojax.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5600b323ea---lexoromiwof.pdfIn PDF document text
    • https://puntoagricoltura.it/file/potamezokub.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/25802382747.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/220d863f50958aa4da4a9a1d0a724342/826514558.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/naxadekululor.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/46532749716.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160883a76e9146---48542345785.pdfIn PDF document text
    • http://cosyromania.com/media/file/megivadalusibe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b062fbc331---jikomab.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jalegiwowijepabogav.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108160036182484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fundamentals+of+database+systems+7th+edition+solutions+freePDF 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_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 11000 bytes
SHA-256: bf519679ce190119ca251ccee02fd74474ef18d8c407cfc02d1a12707e6f2886
font_01_sfnt_off00014ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E7 19832 bytes
SHA-256: d6e5b38a03ae0e898217c4245e3e5408e782ca863031b3f624d07ad832e57784

Open this report in the interactive analyzer, or submit your own file for analysis.