Malicious PDF — malware analysis report

Static analysis result for SHA-256 185c2d357490cea2…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 12:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0da811f994e34236a516b93a1eb4491e SHA-1: ebbe23664d9a38b0f32f6d9a6dea541958ce3104 SHA-256: 185c2d357490cea21df73e1b8ede9c259a669bfd74b8596acc411acf619f5cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3e032eb87---42477514744.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4c2eovtngibjcsa71t7m4tqb03/vilamufu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/67458128217.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/90997385029.pdfIn PDF document text
    • https://arerp.kr/data/file///jigirufitufibat.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/68640609376.pdfIn PDF document text
    • http://hainfelderteich.at/27089964362.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae48681ab---25953481417.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/88978577041.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ee802b5c---beketelifatijivuwur.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dd9ckqdn7iid6c4ig0t7h7d7b2/66462689367.pdfIn PDF document text
    • http://vititanon.com/user_img/files/xorujokarowobapimafufisux.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/58449693764.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bad8d247812196fcfe2ede616cf15daf/xilojepowimag.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160af86b1d2d63---wajebasofajigezuda.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mj6b5uq1u2ot7f7p91djcoujkv/8192617962.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66caaf042e---xoxuwusodokijumopubejo.pdfIn PDF document text
    • http://envigest.cz/upload/file/bulitopodobosesup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b8o8ooujbteg0ik7k59eq07h3l/jumukagifowadev.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/22595755183.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/rovesegejix.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/pixikonikozusutanujavifa.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/lekaji.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/35804622717.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afded93bb33---96287468945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=afflicted+meaning+in+bengaliPDF 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_off0000c108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC108 10552 bytes
SHA-256: b2904a8cadbf2e0bde2300b388d6dcc8100b8f2b5ea06bb6eec627f6a5ff68c6
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 19044 bytes
SHA-256: 343ca25cbf96641daa5636490e178d01ecbee158e6ea9bc838a529fa34696d4a