Malicious PDF — malware analysis report

Static analysis result for SHA-256 368d2928bb6c6e94…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 07:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77bed85e778578c3cab6b540e085b55f SHA-1: d45184aa1ad588517384066c84dcac70a968ed36 SHA-256: 368d2928bb6c6e9401fd93760385d6ef9957f7598ea4107c1380360d84a8a283
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1bd02f470---96061939214.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098a675646fe---kowamoge.pdfIn PDF document text
    • http://tzsunup.com/upload/77802699348.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/36423393209.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc482a388d---30754450549.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5ba8f7c8953178afb1ac9e819b395cb2/givonikijilexot.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/99909025541.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2497555c5---19313353830.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/dfd6943a0c444f6d4aee828e00c249ae/31983702925.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e737ab41---73431235375.pdfIn PDF document text
    • https://wasael.com/userfiles/file/42149486448.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8b6bd53b---98823151183.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/73603779180.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/fitinetidos.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/jufoxowinawu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2a54bd6294c62c2ff5b164612042f6d5/49776387447.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/piroxolasoka.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/89745774291.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/9514706988.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b1e161d0e8e3f05522689e0f48a18a4/jeninubokuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vari+lite+vl2500+wash+manualPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/67984676080.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 18716 bytes
SHA-256: 32d2d17835b1c6aa666ac5553d63d7b6bca3351c0a438d1f38c51e84ef70af91
font_01_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 10848 bytes
SHA-256: 2594e2bea94804f2b61d1d0085734310c4db8d21f017c31b730b1a1e53200932
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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