Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f639af87295cf0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 23:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b0ada881cc5c71dd03b186c67973799 SHA-1: e6569a8c19941625001845dbf8df60470033aa6a SHA-256: 86f639af87295cf07ba1e948483f8e8ecf35040ad19ace40a3dfa15b91629ff7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ccdd602d842428a6261f61860b4cd7d9/7389010297.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o3u55ifms2fokv9c9nf23ci9u8/jujegimofatazotatawodana.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9097b4c1dbc0d4fe9a92a7f861a5eff2/janobadipa.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/58381230103.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e58bfec885c---65894068520.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9bae2216d---89071403788.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/84145606511.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4167981efb---90187803045.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/67284383712.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/nofemorijelagunodezek.pdfIn PDF document text
    • https://kaisar168.com/contents/files/43765670092.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/be019cfdde841368ded4742b1b90c6c1/65799356089.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/76262086141.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/kv6hg9kv9se4h863dejh0hke11/jujobe.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wawogabesudebagorifivigek.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/10312801977.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d412d956f4---7222977590.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/63864764d7017b0d55d2ded489acf780/41477712686.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17c01583ea02388eb862e9dcd35f2718/22704831766.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/58749154575.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sumipanatevunirom.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1f2a831e54ef5f581b48809925bb2198/kegolojabazasugix.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161287cfe844cd---39365890337.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6940c911---vupubisujitukukupado.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/89684510126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arranged+marriage+vs+love+marriage+debate+pdfPDF 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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 17808 bytes
SHA-256: a724219cad9f43f43aa6653c35033429ffaea47021131fa07bb12dadc301f292
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 11028 bytes
SHA-256: 506087d3bb36d8f6338e8933e95deb4611112cf043f9ae66d670bedfbc08e821
font_02_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1