Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfc42a0f8dc8218…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 08:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2d79ec6aea4d782bf21d7845f8730fb SHA-1: 8bbfb68333b64a3fde385f5c416fcd511e2bbd68 SHA-256: edfc42a0f8dc8218c1a043aa32228476029b2e75edbe548e6279a8a7d2622ac3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous URLs, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the ML classification strongly support a malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=best+otg+app+for+android+2020 PDF link annotation
    • http://bsinteriordesigner.com/userfiles/files/vinajitimepinapegonez.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/vimilefudewatezaxotadoki.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/daxoxosojipizukigidazebez.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/takegadoresavedaxajud.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/84201133509.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/56667092434.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/woderugo.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/natijumele.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xaligelewuvumusifi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm61k1kq5jv1dneoe9c7icbd53/53382521097.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gevag.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/1834129704.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dowiruvasidekositega.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2v8l71fqps7dl20drj5o407lv4/nufikojogabazifev.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/gorazepogav.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/wilunomejotovefufedot.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139370ee8030---pegewuzenogomize.pdfIn PDF document text
    • https://12tiga.com/contents/files/zegekej.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/sofozaraku.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/12fcd36e7277d5f2fa0cf404947993b6/5679030071.pdfIn PDF document text
    • https://digireg.sk/upload/73195687913.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/34625693271.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/50799747945.pdfIn PDF document text
    • 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10920 bytes
SHA-256: 9bc1eabbe176d097b48f905cd5cabbbe72981b9fb77dcccfae5a78cc24eb44cd
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 18056 bytes
SHA-256: afad1c2014918dbf6a782adc086b7861fbd2636d32e71eb0aaca7dd69a8e56ca

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