Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cbcb7a11a0dd4d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 06:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ca0bc48b3460b959a12f8dc4ef32d2a SHA-1: 758d916c591af278daab3404dc84b8db9b88ce9e SHA-256: 93cbcb7a11a0dd4d5710b3e2f59d123be4cf3078459a2442fe7ea6d937dfdbb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The sample also includes a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure victims to malicious sites for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=how+to+know+if+someone+is+looking+at+your+instagram PDF link annotation
    • https://safetyhanoi.com/userfiles/file/gususigifopu.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/nelutagosiwokoxipetasugu.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/43446892500.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nulalelisib.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/6736518320.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/97791489483.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fabelamafosuwa.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/polabofimuwefifir.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/078c697570d965efeb64891ea1f8fc1b/59922559867.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tupanopabujajazewigabe.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/88425548563.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jojetafupomijibunipesa.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/zorelojevakaf.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/bolijiposiwisetode.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/19cd8f595db7562e76772511700449fa/47844930457.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenosobidov.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/26971489491.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34edeb624551cea102bbb1dda68bd281/66969695283.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bubinepudaxarogexoji.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/jigotodekulilajoroxixiti.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/4130176144.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/25642294798.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/gazudu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/putoxit.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/dowidetabixiguwadij.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/85491832808.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 17152 bytes
SHA-256: 6404423c48c4abb5aec46b1fd2afdbc04f01c6e73f065d1ac839ba448ddd5bef
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10940 bytes
SHA-256: ecff36b333f5f6670e0ffb34dc088a88ad05067e1114270ffd3bb157c2df4022
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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