Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d8168c0053bdf8…

MALICIOUS

PDF

79.5 KB Created: 2021-07-16 03:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 740872082497c40c760d46faeba12cb0 SHA-1: 3dbf08994015f35792b50e580189dfc13ebf28ae SHA-256: e8d8168c0053bdf85b8bf3c7df9703b6e56ba77ddfd902c364484ba18757fe27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ba44326f---didapadibobovatigoji.pdf
    • https://avela.md/userfiles/file/vuvakivapuxejis.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/zadesuzapuzoberegejisape.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/21612711346.pdf
    • http://altelaw.com/uploads/image/file/48540145668.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/46ve7es0rg299m0es8k7bmel8d/91120341453.pdf
    • http://allnatureint.com/userfiles/file/fetukox.pdf
    • http://abnicum.com/files/file/5972117115.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qqlqirm5aboia7bvfn2iagi3cn/vavasuk.pdf
    • http://ghalemdi.com/userfiles/file/6526892892.pdf
    • http://architects-desk.com/uploadsfile/21502085141.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kvq2e559k6gsd9ida65amedba1/11980232772.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2e803afd---wiwaniwivusolumipiwe.pdf
    • http://batterseataxi.com/survey/userfiles/files/63989363859.pdf
    • https://natyabio.com/uploadfiles/fumod.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64228b21c---52725662082.pdf
    • http://ehomeforeclosure.org/images/file/38669486277.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d4164822---tevedawopu.pdf
    • https://havanic.com/cache/fck_files/file/jemexexapibarimodekofa.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c368defe3d9330ec831130d375d5403a/lasijasasexosawak.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c87235ea200---92732608696.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=trade+barriers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d950.bin
adebbc29218bd1f35527663efbb2ebb94d36475c453cae03593ad72c7c714739
pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 10228 bytes
font_01_sfnt_off0000f017.bin
e0a17eb18d16ea244ab89d3fa0d8d42c46c2408e738defad2bb92c5aebfafcc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 15956 bytes
font_02_sfnt_off0001191b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes