Malicious PDF — malware analysis report

Static analysis result for SHA-256 819cc4a0366f95b2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 09:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24200a9069b581726a10e8668be45f49 SHA-1: 6de53751d06e6bad4baf3ad8c7f0c41a9d40dc0b SHA-256: 819cc4a0366f95b22a6b271187127f1ad7c260818df72289ad8fc7aed77be29f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec75016d7---36129046543.pdf In PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52742901801.pdfIn PDF document text
    • http://groupkaishan.com/d/files/20417365377.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/tegavinurenuxexivefal.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/17541426959.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/61769151837.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/nutewej.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/makajelolebusegiz.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/kofed.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/timedaduselosubefafomisez.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613749dc20f80---43756775381.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/82840185076.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/zokalolesiwabawareropedim.pdfIn PDF document text
    • http://zimmerei-possert.at/15401849041.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/95722273892.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pifukogejajulusojiw.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kuzesujoxuwusub.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/72882851125.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/kavid.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/72169470325.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/mutojikumusininekana.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/35003121611.pdfIn PDF document text
    • https://nada70.org/userfiles/file/mowepizemidavoxisogeri.pdfIn PDF document text
    • https://datawire.gr/files/files/budaboretanasosetogareno.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c87f4d549d---saxosivewulawetesumope.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/lasokusagoxuged.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87590f115---pesiruma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=modern+family+season+11+onlinePDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 10576 bytes
SHA-256: 5df5009aad2bf32db366ab60b6cae79bca6e0fd90a9c506b157ca6c2acf5babf
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 19564 bytes
SHA-256: f7d0f7cb0c7205e1532ed33b5f795ee6cce9c43b9d178d0a73ce946df9b0ff12
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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