Malicious PDF — malware analysis report

Static analysis result for SHA-256 174f14c7648ff936…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 17:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85b7b36b31cd2393ddbf1ade1bbb51f2 SHA-1: a70dedbbc00c066c954e1299be809e3232584132 SHA-256: 174f14c7648ff936eda61bf7b042fcf030e3ea79d5281a328583271b85ec7d79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=sleeping+beauty+waltz+violin+sheet+music PDF link annotation
    • http://danangsculpture.com/uploads/image/files/92767623427.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/32316090394.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334ead7443b---3401783154.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/firuzarosinab.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/mejifatibenaxutijirogi.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/zojosalajogoka.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221cdc85d5---geguturebufus.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/liwivib.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395299a1bd1---mewixujafogorulib.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862f9b789c---88021885536.pdfIn PDF document text
    • https://path.mn/userfiles/files/33904351479.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/56474833376.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/14538996976.pdfIn PDF document text
    • https://pepsima.biz/files/file/bumigi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/munokarefejisasevemufo.pdfIn PDF document text
    • https://securitydm.com/slicice/file/rezawivegejevusutijigebe.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/5837168738.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/fifuveredog.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/5517316608.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0hanf0f5o3bn3c47mqnlesoa6r/21199560671.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/77660283426.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090921003389.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349dbbc8dbc---99521349653.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/82645283104.pdfIn PDF document text
    • http://strandedtattoo.com/file/ritexuboje.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_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 11364 bytes
SHA-256: 3097f87baafbf393d352a7b0ee545e4ef25c454f681f80f1f4e361820705960c
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 18376 bytes
SHA-256: 4c3a8fd8f525fbef6e5ce5b6dd3b23323c5c41e9c63f0dd20d6d1b6fbc0b0cdb
font_02_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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