Malicious PDF — malware analysis report

Static analysis result for SHA-256 885f1e1bb08b099f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 03:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e781c1a9de34a9dc376c9d8912719b4f SHA-1: 3d335e2264acf1941ebacd3a17df78ff8a37e6fd SHA-256: 885f1e1bb08b099f8ef11ba0da98ea8e3564df5f7a82f43a140d1f2340d805be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, which in turn host other PDF files. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/bcb0b9cf79b36aadd193b3c660aaf7cf/tuzikaj.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa9ccf21c---mumugizisiponezojijije.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/lidevupotajikulanazufem.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qi0s3idg32g4eeqfm241ojqj3f/tagirawodepujas.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6379d4733165fd3acdc1f1e1012720db/basareve.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602f03ce6b---88876663473.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/30238424626.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607148f0ef920---1909942216.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/80871289010.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51f70e876---53811031989.pdfIn PDF document text
    • http://xycrusher.com/d/files/vofugemixaz.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/pigipedisonuwomiremex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e4e0bbba3---59918547772.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/52133419935.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/91824951039.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1daf043047db745d088080596cef0ce3/sisotelibuvanar.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effc6230326---34172963831.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/30144956449.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/pafesugetoj.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/mugojokanilaletoze.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fixesezabupilezezubokugif.pdfIn PDF document text
    • http://rld-carbon.ru/file/56563134260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+apples+in+minecraftPDF 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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 17316 bytes
SHA-256: 9588b4ad6262fd7d2f1811371cb4de3c36e8aa3eb98049520377ded97bb4f906
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 10900 bytes
SHA-256: 28a01a1c4bb9fefa840d813c97dfc1d2112cefa089406cb282d687a4dd96c6ef

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