Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27a4fb6bb4de80f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 02:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d617da617e4425eca34ddd77fbf0a8c8 SHA-1: 3cddc6cc8a6c2ab639a53f8484b404ce728a45b0 SHA-256: e27a4fb6bb4de80f672b60c9fde0c5c2169df2d968e63f3156249a5facf5f20c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://archism.ru/uplcv?utm_term=seo+find+keywords PDF link annotation
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rebijako.pdfIn PDF document text
    • http://exima.kr/userData/board/file/14462972388.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/javemanuru.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/namuxumirela.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/nebivuvosinenewozizekidu.pdfIn PDF document text
    • http://cmtsport.com/pliki/famidumodevidamofazozed.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4cb37f040---sanupama.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/rapifabuloliborodedabiral.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/76396368658.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8a40cc35154e84950d4a67217050a85/tatodetujoge.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/paluvumozawagadidu.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210911_151020.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/zavusiziduduk.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/51570144014.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/lereduxiwod.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/dusibibotizunisurexozu.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/34680626924.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/kigomabamugopojoviferaxab.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9b6566c1---bapumovole.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/duled.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/papevumege.pdfIn PDF document text
    • http://unseretochter.ch/images/file/44450731700.pdfIn PDF document text
    • http://artospace.com/pics/file/sotenexizib.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/3005418653.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/88861214571.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/10201027295.pdfIn PDF document text
    • 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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 10408 bytes
SHA-256: 4cd169fa4c434efaeec09f7c9558921c89a274ea95cb735c05ccd1b218df90f0
font_02_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 15180 bytes
SHA-256: 7569472c4fc2107bcacfcd18ba83bd6351d43bc64999a0dc6b23ce7873cc15fa

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