Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16dd832a4d61a83…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 17:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1734c8cb99f7022380a60534538e699 SHA-1: 288b191f50c18eadefe6e665e6bc7360d588a61d SHA-256: c16dd832a4d61a832370b5709fbc38ad747a0db83e615dca150611b68c994b03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=blood+concept+map PDF link annotation
    • http://gibisch.com/files/files/67699177324.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/65024813736.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef7c7eba6---dadiriwup.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216685625609.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/50689396274.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/85ef8cc76eebbc99fdde51dd79c4b817/dalukezuvasakamabuzumuke.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c0abba26---70161045547.pdfIn PDF document text
    • http://www.polni.si/Images/files/28685669061.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/43477000463.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/39201458259.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/27010361753.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210803075934.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c42bfa2e580e1508fef89be79a4ac066/mogenami.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5d0554bcb---109483150.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/63763323443.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67655441f55eebfb41cb52823574ee29/wujojutewa.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xaxivitanefereba.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0706/8f6a96c4fd3d2bc68fa9a1eae5bae499.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828de8c488---xexebutope.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/xofozorupojenetunisupe.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/75083859221.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/6jocll7pngkttc259bk1qi5mc5/53503533490.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed4122ff7---1129028295.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/22244905931.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021083021520877.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210730_43BAF7998C238F20.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_off0000bde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE1 15688 bytes
SHA-256: d4239acd18eb5a40666924e895149f66d4cf02bf936a37ae288681c0733ed33c
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10368 bytes
SHA-256: 93bd27dd55eed7d5a926365c69c6d68e9a23e52bd48918adffa5dc638035f9a8
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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