Malicious PDF — malware analysis report

Static analysis result for SHA-256 195ae09fcbc8d48c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5832ecb584139046b6db2acbd2863cbc SHA-1: cff09690734705a7e74626593459f4986b3ce990 SHA-256: 195ae09fcbc8d48cddc2387be40f4c627240ae31677f6677eba008747d479cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/95729479755.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/1278042757.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/96236909082.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/90618314150.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/kibatumavutusanumel.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/16882439783.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/xewuzi.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/lukuziditow.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/dojomugefujavaguse.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/wiwuzogigixorotabo.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/30405255427.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pogawozekaxuropaleno.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405471bc8d6---tuxadelivebutefivoluv.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/40817941119.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161396d4874b0f---favoxajatejowekopirodebu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/batapidisaje.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/siketapolojovumuju.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/51c255a01080386a9f527d7bd1452499/97202769661.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/45630672945.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/winovaparebekifomafetukep.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/felekajoxofumowo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee47e2341c---27464278561.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/28793281278.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/mupaxalefidenuzeko.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc76eb316f---xasojotixasus.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904175749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+prison+break+season+5+episode+1PDF 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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 17988 bytes
SHA-256: 3c3abd4272262c3960db1d92ac58f9dd097f363fbdaf25f005221d4b33056355
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10976 bytes
SHA-256: 1dd6700d93d353b09068911deea622e855aca1bdb89d1d7083cbfbe3e957af6f
font_02_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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