Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2cd28a33a1cb04…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25c785358ee9e8a9750b04c919cbf320 SHA-1: 4c6a04f4042993c27c142330eecfdc1a7918643a SHA-256: 5f2cd28a33a1cb04b11ca729fa529c64b560bc1fcd6466face679655a923a00f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or redirection campaign. The primary goal appears to be luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=chord+melody+guitar+pdf PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/545d02692ef67ed4d9ee44de2a306620/tokesowo.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/sopifepe.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/846254756.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vimuluropiluduxesipas.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4df90ff3---keraxefuwidokuwezelaz.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/dujelepajabafem.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161450a023e261---xodagulavejirajuliva.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nidazuxesuveloxudufozasis.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/fefuj.pdfIn PDF document text
    • https://harom.ro/files/file/nonaximetudaxuz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267c144665---87123380588.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8c1612cbaba120a8346901c41f72f6f0/10458825280.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gepar.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/boviweliweferimagewu.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/jopatemiluzu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lixonirisinusejoto.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902235730.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/63542133527.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83431490390.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/79064862311.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/pikodejum.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wepamedifubepa.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/46271001338.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/79634883143.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d10bb4bf3---tilopenekaposozotimelem.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sezawiwisiturar.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 17508 bytes
SHA-256: 089a2f6876461a74bf4825ae5ececdd2e32c9fc1687cc3cc1edc84fdb18e6c89
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 10920 bytes
SHA-256: 69c57e1cd0af67e2ee15db169eb36cfdd8978409e59c98fb03115b9cd009d9e8

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