Malicious PDF — malware analysis report

Static analysis result for SHA-256 616edd63b7dc74ad…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 05:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ab10b0643f6a9362de8936cc2d63ea1 SHA-1: 79a0fd340d9963d99de79302c8552af4f9115c33 SHA-256: 616edd63b7dc74ade8d7fee9626ff11eee2ea6c39351cc003d4b7ef622b69d88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to obscure the malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=tadeusz+borowski+dzie%C5%84+na+harmenzach+pdf PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/fatoredonaf.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/givp1eddn7h4hc0e6cjofitded/bedibufimob.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/53066154457.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wigudawilirikaruvitijeb.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/saxus.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079584d4f1ec---givekufep.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/i6pcbjt20obja5qvt8s9b0ctiu/ninixoluzipazotosaripene.pdfIn PDF document text
    • https://people11people.com/uploads/File/zedisamutogutitogudewobok.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/91553623768.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/bapujufakotafumeniwijeli.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a1130e932274af5db4c1f4073be722fd/58960554419.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xoxaxuxuditufo.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/volul.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fed2cfab307b2fd75fc2937a2e9f7a11/42585493164.pdfIn PDF document text
    • http://spbi.cz/res/file/59412241698.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/12829871749.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b044eb55c52---53100353714.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cf2d0eef---92219994441.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/4825072751.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e0a9dfe5---petesedelozosixomusukoki.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dakasizijubipetiba.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5125847d3bc22d508dc81f25301e4314/48497604190.pdfIn PDF document text
    • https://majubesar.info/contents//files/besagane.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/11524263857.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_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11308 bytes
SHA-256: cec05ecf3ac7d7d1d1ed4319db9da6566ad7de50ba2e6c587ac42ce12724cd83
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 18756 bytes
SHA-256: b96e5aa45534685c0fd67841980e9c67649bd90ade4043cfd686c58509ba49e1

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