Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf344ff3dcf84eb8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 03:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b6783096c392f2071040d4c64ab3211 SHA-1: 093ac7911b42774dfde0b9880bf792e0023702f9 SHA-256: bf344ff3dcf84eb898853957d71f66b5ff6b53657884f452c4c9dcca16657da8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure as a link farm on potentially compromised sites supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9af7b9d1---pesapaperiwawoxupum.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4759ebc9---giwosowomejini.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1656aa227---jevutixamedijakudadazu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/954a2d0303de6e3533e26b94723c9e9b/lasobarage.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/sovorenumazovefigemuvedik.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072809ce62b4---valesogipexebututa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/32236593430.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acddd78fdbc---96994756506.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/98747469832.pdfIn PDF document text
    • https://sinarwaja.com/account/files/70908108888.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-20/20210720202041850075.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6dv3bo94usu632l5etpvv65ijv/jisoxusagidozafez.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/55859453242.pdfIn PDF document text
    • http://koronowskasm.pl/file/66214029134.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58429439880.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/7931783478.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/37929715458.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160906bf301df9---54394765676.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/bufelifizigerobizodafo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8gr1n4pcut8jbbtoat7u9tcum2/75201182124.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/nujitetelofuteperasomek.pdfIn PDF document text
    • http://rsst77.ru/upload/files/87753996074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=accounting+basics+quiz+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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 10944 bytes
SHA-256: b89f788454e9b0edecf9e9aa40f2f1a1dd550474d53f6f9b22cd1631cf8e513a
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 20072 bytes
SHA-256: 955a991b2693385d46282bf9aa6c8440b8766b43c44c7ee73f9c97b9340040b8

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