Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa71ed39582444…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 00:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc978eddda319716d9d8d49a12762b76 SHA-1: 2fa373098e80dab0bb4cd03f29673b4f712546a3 SHA-256: 9daa71ed39582444f3d7ece2cf645bce9fe6d6e08b048f3189fc13b1f3b578f1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. The document functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. This suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nieruchomoscikomercyjne.co/files/file/55119211800.pdf In PDF document text
    • https://kawanmto.com/contents//files/suvivewepesizumobuv.pdfIn PDF document text
    • https://birudongker.com/contents//files/rajapufuxexiberaropulawo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/jufozevevigalitojawez.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/14581765285.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16092507dd4ae9---pexewunugatilisakufi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd96ac3b3---12706500785.pdfIn PDF document text
    • https://termoformat.md/img/files/marurexogonitedogapudoko.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/65679101576.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/32413317086.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0291414d---dagojurop.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wujefimeburilowe.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/jituzikogutenetud.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4e838e9469c4d5fea5ad767414a8ef0/13928275298.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210731071544.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a8b2e6fb---dirudoxegarepasupitu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/74930889204.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/jalemaxorokoninagetew.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9c6ace57---46359665188.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42316373331.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/84309365353.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6n1sgod9s4fvihqtt5fdsinoil/81924968182.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/balosopopudunazaliwulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ibps+rrb+clerk+previous+year+question+papers+with+answers+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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 11412 bytes
SHA-256: 7e4f94965597922646110c557373081d4c44c9f76cea5fc8a65a4a1d4c4e9146
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 19588 bytes
SHA-256: 048db0e9d9db1146bdc8b43b3b0bfa61d68dee9f05134f01b6d31f7304f14b4d
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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