Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a35b20a83962a3f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 21:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f95794d992e9df917cec56fb35f687fb SHA-1: 2a0528c87fae384912d1d2fcbf023d2c867d911b SHA-256: 3a35b20a83962a3f81e10c744fe19162924362b264fa00767f894749ea9c9ff1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links with UTM parameters suggests a phishing or spam campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=this+is+us+season+5+episode+9+watch+online PDF link annotation
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/681530433.pdfIn PDF document text
    • http://wdnederland.nl/file/13394315600.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/penapon.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/wonenedop.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/pirutuvixawab.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/fasigi.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/52516651481.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/38039692216.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401569d2c---lopizaz.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/56677025124.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5e240aec---47158810578.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/japodetapi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/wetodufavewoxikafa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/be22054dcb034e78073bb04a731bd482/menaxitomewabubuf.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/dogigitubejarebi.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/pelubojesanuginavopagita.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_2BFD0499974FCE2E.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/09/mupovipuno.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/vagedijolaludevisoguzodow.pdfIn PDF document text
    • http://tercovci.cz/files/file/53203274230.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/lozizujegixiko.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da36d51d9---13717588359.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9ff673208879d3f19eae76741f3005fc/xobolutatofozejovukekus.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/begosizojezizixif.pdfIn PDF document text
    • https://geloracinta.com/contents/files/39804432594.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 17804 bytes
SHA-256: 2adf1211f9075e44d66ddf07e96948efa77c0881b240d0c76675102bf613ba99
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 10960 bytes
SHA-256: 3cdd846eccb56be78af580b69264a2a9b2a65427b82698a1599958e70a77ce7d

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