Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b95d2486ee53a…

MALICIOUS

PDF

136.5 KB Created: 2021-06-30 12:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d92ddab3e36e08ebe430a196c599352c SHA-1: 1ad338463971ccb470a4d020622efd0f6aac526b SHA-256: 271b95d2486ee53a32d336081c36f8ad86787a1a98018ef6fd77c45b09d4d7ec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67bbeb1cb---bumekari.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/81d2defd69e78253d341d6e2b2e8cb68/pifojozivogu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/14774633048.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/35214887f6bb69ed10e2651b331acfa7/dexikutafezagukusizeve.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/50df09f591a9924b49a3198f922398cd/72801579537.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/93245435947.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/degebosedurew.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3852e7c7a6b28621c03e7f91e810d850/vevawezomapavuwofafepomiz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b409af32ac9---72916164186.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/53975041638.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zojevoremo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eea85d3e2---86821254911.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/zopitasasapugaximubalop.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d15e42948093e0630c5df12c745d6452/60090341747.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/34897220031.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/83363095882.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0368b70e4---92947040206.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/jasolikuzapudenalovi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4d9eed30fc0eb2513ebf4157fa2417b7/tevezeroxotodazirepe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/03379f52b9ed198f3d51ea4c9a5741ae/40234400377.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952deaa24b---puzonurexi.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/92422676696.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929b5ca842---37924087417.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ffdef020---zanasonokufaxotanuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=toxic+confusional+statePDF 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_off0001b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B36C 19440 bytes
SHA-256: e19333ddbbfc46f284ce577b45f8da53d2fc30bd26593dc3b8dbce3c916a4ba1
font_01_sfnt_off0001e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCD7 10392 bytes
SHA-256: 2ca4252e46bd778c6269927f20d0bd53a215ef145d6eb21388cc3d940cf7ae2c