Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da3f87022bafd0b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 10:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8c02a15f85afb43d23a657aa6920e10 SHA-1: 7953c35dc915d25a1782355e6702f588fa9c6898 SHA-256: 0da3f87022bafd0b701d8fa060417f57b040f2dad64f1ae65c71a3881eb9b83d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of these links and the overall structure point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=manual+table+of+contents+word PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6f5c25171---zitotemodinusot.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f33d06c64cace727c7b4ed6233b9ea94/1789801975.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ec6c5673cf1e6efb82b3badea0fc2e7a/ritikalalejuxemu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wafavemebotetofavape.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/vowogijenogusibanetemajuf.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0451a7cedb8a33ee48dd31b2a8f7f14d/wizapigexezifidazudamu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/72312142736.pdfIn PDF document text
    • https://mmszke.hu/files/file/lefelu.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/1524871430.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/laxarewoxiluta.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5dc8da5e0a3bdd18b61f0bd76bde463c/tiripepuvimuzetaguxifemo.pdfIn PDF document text
    • https://latework.cz/soubory/69726480652.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lugebalaxorepapukefiwusa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7152f6aea2a0747a38c905817ff34f9b/xalukotudativevili.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vvj5lhtgsdf340i36saa9v8nt7/60068726875.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/palirelezajudokiziranu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/saxafare.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/88321455038.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/96578808064.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/44647229419.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/gukafixemex.pdfIn PDF document text
    • https://5uempat.com/contents//files/kefoxojawefejiwin.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607858b24f7e0---fekadibunire.pdfIn PDF document text
    • http://renovator.cz/files/file/72715191272.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16812 bytes
SHA-256: b3c4d35a3a942e9c4d23e829ee05935f67d76e04e547801dd3b1390478c06beb
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 10696 bytes
SHA-256: df4c6a9bd643a960915edd5aa1342fb512c20cc81bd463e0e1cf607ab1b141df
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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