Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9ff1a7ec6df354…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 21:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8388cebe4ab2f06e6f06d21447ae4f89 SHA-1: e427c4bcc51c0b7857c45f7f5c7e2d7690259130 SHA-256: ab9ff1a7ec6df354ebe40d1647f5da210edbb930add5529f672a53cb89542ea7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/22789f7687d7f4affc7448759d1bd591/69450851722.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/67578219351.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4dda8709b---39862800829.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/15473413304.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/34545752491.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/55189644851.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/tutezevuwegexamenet.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec1c7b60c---43932213426.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/ripoxe.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/96964737147.pdfIn PDF document text
    • https://jjpremiers.com/files/juvozetid.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/79607615874.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160868e34a10de---41591334502.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/78dff272c533e03070448a142b28bf92/liwote.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a21a9950---74657419032.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b97794d1c0398a90127c69ee7aa42cd9/wizufuxenebugajax.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/74a9984d5d099d26c00a3af38aa813c1/72119203095.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/162303674161087330e56bc.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b80d0ec066---godawaza.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/15d7c7b34705af384a981956d2d01430/fewexoguwo.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/54556755045.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/ligofidekeri.pdfIn PDF document text
    • http://chieucoingason.vn/files/69681943905.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074097716dec---48056177872.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/givizasegodevaditox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=emoji+with+tongue+out+to+sidePDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 15748 bytes
SHA-256: b8b569cf1804f8da6fd7039edc603afcaff5646fe55e2e308604d707596fcbf3
font_02_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10688 bytes
SHA-256: 959c4059769159871d7278f4edaceda107f81879804b1f239002bb628f2d33b2