Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8982f3bad82ec81…

MALICIOUS

PDF

98.4 KB Created: 2021-07-14 02:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2589dcd8a14d7845be4e4d7ad965cd8b SHA-1: 94dfa8f3b4e88249951adb70f2d66b8c58502737 SHA-256: c8982f3bad82ec81a2322cb1d5b9fed425110e2af2f9b2fa2ad699de0e3bae24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The primary attack pattern observed is the use of malicious links to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://alphasigmaoverseas.com/userfiles/file/28368705351.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714042100576942.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/485f3c4128fb4bdda459a22cd9f81445/54661422077.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4736eb1836603a46ece02447908e69e0/pozaxow.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c62481c15---33082461186.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160753193bf6a8---876344584.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/869b71ccbb556587ee85917d40db096b/walofenibenerosipavafez.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/r534adeijn706eaej8jtnhngk3/71450681882.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/11495633292.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/8957206471.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nfs8bgiei8059olsgmfjbb4ae7/mebebuduti.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/29236708926.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/62928963237.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/67316585100.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcb8d3125a004e2c4068cdcbc7173186/bovozukupaxidiguvu.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/88590522934.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/10216184218.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97933734411.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607173cb1fb32---furomozimub.pdfIn PDF document text
    • http://zgic.ru/!upload/files/sugoguxobofafoxosu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/91070491295.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/vutedegefakajidam.pdfIn PDF document text
    • https://yuss.it/file/19039636386.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/63546251840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=an+element+x+has+3+electrons+in+its+outermost+third+orbitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 18112 bytes
SHA-256: 308cc8de6650f2e0a3abeb7013de74e655bf6bae4cc4fc84b8cb57ff9a232b4b
font_01_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 11132 bytes
SHA-256: 32b405cc2e95543b217c9b861867e4e6874580d9425af5c8db64d0386f74ea3c
font_03_sfnt_off0001631a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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