Malicious PDF — malware analysis report

Static analysis result for SHA-256 61995ca1e640f2ca…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 02:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6b2f05a345c6092248fcbe1bc0f1bd7 SHA-1: b0a407e20ad8e7782cc8abd0ab52368332e2c10e SHA-256: 61995ca1e640f2caa59645f61137e7301e68242318de91d224841996e6523a4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The presence of a JavaScript action within the PDF, combined with numerous links pointing to potentially compromised websites and link farms, strongly suggests a phishing or malicious redirection scheme. The document body was unreadable, but the heuristics and URLs indicate an attempt to lure the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc502ad6dee---28882864146.pdf In PDF document text
    • https://schmitz.cz/res/file/sazaguxumid.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/78910853358.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b456a836860---80108154128.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6fe89dbb---wofajedudosinu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba101cc3b1---pozaje.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8769dc0896---64024690605.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/ketiwiledab.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d874afe56facc622edd848b8a5cb8347/93816073101.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/97340885425.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088d0313297f---wisedu.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/roboxi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac236be296---fukulerawilusoza.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efd23e06d---wexafalevim.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210606_A1A2FC9129278F5A.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/gotiber.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/rexadefiv.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zewibasatumaruwasiredorod.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/zaguziguvu.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wapepatituvomogolufe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f544a56b7---99322842879.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/42c2e41e6927c3cb258208d41ccf4a79/kukupaxegubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gradeup+september+current+affairs+2019+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 11356 bytes
SHA-256: a5a7aa0d30cea61f622d15e27c23ece208a63a01804f29132e62b9d8543bf713
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 15196 bytes
SHA-256: 4075004abb0a4228de2e71b2a0c10e9f97820d818a78b43935d123addad6d5d4
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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