Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b32d0bc994fd28…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 03:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65f37e163d02a77923b7a3c34c5ca442 SHA-1: 046abe8f89bb2e2dc4736b3811e699b3bdbeb60c SHA-256: 01b32d0bc994fd280ee69124bdb6f6b590704c562b76e79d17ea8359ed722742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term' parameters suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=messenger+apk+mod+download PDF link annotation
    • https://zohopinler.com/calisma2/files/uploads/jatudejenavoposo.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/40804303306.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/13228462945.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/66054262157.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/69047519546.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/35045449441.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/voxijakabet.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/70229378182.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f53mkmbu1berkkli6h2s6mkuna/gujedazojeligora.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/57760514847.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c6ecf57f545dba10e07b9fd73a522636/76894677823.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/mujanujifejimix.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/51795512390.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/fofositijetewupusegeba.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i0i9clu72tjsm0er07vrjah416/26849006639.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vovali.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/rusolufitujuzuk.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462e10992ee---29457737197.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/darobamunimepuratuw.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wikuwumemenetonemefoxijik.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/favalewuri.pdfIn PDF document text
    • https://tl-systems.hu/files/files/bexaweda.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zepezazowegamidizanuk.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210917180641.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/lazesaparepikunofupekaja.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_off0000b3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 14476 bytes
SHA-256: bca9b5fb1d10bf1af1fd8af8a140cb51a23f679ce0e7f1d4ea7f0ae0d2dfcf46
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10716 bytes
SHA-256: bbf31a57aef4989af496b6a032dd543bbc215bbfec57e4aaf361c8fc6ca80432

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