Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac7278565697a73…

MALICIOUS

PDF

79.0 KB Created: 2021-08-03 11:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4dc91bed26cf21fe9a0a7499c7ed612a SHA-1: ddd21b9136b16ce787b6021edb20b0d55b500ffd SHA-256: eac7278565697a738b26f6727581c000a39bcf126b66157238adb36e1feac83a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://autavrabek.cz/obrazky/file/nudofojomegodokeweto.pdf In PDF document text
    • https://jamurgoreng.net/contents//files/xafibabesovelove.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/bevewivipalidin.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/jirat.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/talesetawezezob.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c4e466d028831e9878c078da0b893c4e/laxajuseminogumuwexuw.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/50919aa1a04d150d1a5777b468c91ff4/wewana.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a1b2e6d---woveraga.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099337926a5b---55874198588.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/56187400296.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/vif87rugdnn960re48jtr5gssi/sudesemim.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7c3h9vt0flhc8l2hf27atjdpq5/48774173349.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/36623828112.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ac0c2l8js4gq902344qp09sip7/59672346031.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/42863260607.pdfIn PDF document text
    • http://chemicalengineers.ie/images/poxenekazubive.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/selmjh8nst45tpjvurh8p5i83p/jaweniloxelokap.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d9c2df39e5a4b362fdea8c225bb8e2f2/76407885767.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ae918f387acced7428ca53799de55fe/22984100569.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8405913936.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5ec0bb2d---vivojaf.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/1011016156.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/disunijezipiritom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=krunker+io+cheatsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 10464 bytes
SHA-256: 8df2172e6ea5c881b064d58d8cee198b6c64394a6ab5abd5978c596503faedb6
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 17132 bytes
SHA-256: 2fd9d0bd05e72e6a53bb621cc1fa06017ce39339d41b9529ce48fb55dc1ad120

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