Malicious PDF — malware analysis report

Static analysis result for SHA-256 342a5fd265765f96…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 16:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddba6ddf6d9e02e11f5fcfb3dc6fbf71 SHA-1: f4e9b818b0fbddb0983b0ce00717a345023f0a90 SHA-256: 342a5fd265765f96169842e7994a3b74f03bb9ad232d93fe455abe99830a5f32
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The heuristic firings indicate it's an image-lure phishing document, designed to trick users into clicking links. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://humanitool.ru/userfiles/file/55150355865.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138873525ba7---96073674191.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161389c7ad6dc1---83719144181.pdfIn PDF document text
    • http://praguetransfer.com/files/file/78584280573.pdfIn PDF document text
    • https://viettrungson.com/media/Files/68333991840.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/44547798500.pdfIn PDF document text
    • https://computerzone.pk/file/37003706505.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/24830399510.pdfIn PDF document text
    • https://ibextrail.com/editor-images/54502189949.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/97486909665.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/8086793653.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/mekumakozixanolakafi.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/sejudifevajadezisol.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1033663839614cb1ae68194.pdfIn PDF document text
    • https://isgz.me/userfiles/file/fobenuja.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/72382447276.pdfIn PDF document text
    • http://topp.pl/_topp/file/lowijegusaxonosekoze.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/70150371054.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/45002394663.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161512d4508914---zijumuzof.pdfIn PDF document text
    • http://samtekelektrik.com/files/96466119355.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/14354358886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+long+can+raw+chicken+sit+in+the+fridgePDF 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_off0000ad9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 14656 bytes
SHA-256: 2098636ec33ac9ec7362a09a68e78d002ac24ff075f21410b25bb0236e1937ed
font_02_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10924 bytes
SHA-256: 78c51b58e32b5b0757e115ecc7c16905210a38495db71f75fb424dd4c61cbb00

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