Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6da14b376717e4…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 00:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3cfdfe7ad763b1932506712d6658d32 SHA-1: 1fd5361148aef3d60673537f0b4ca6d4496fb6db SHA-256: da6da14b376717e4b733760cce87be15514dcf5f04672f6ecebb7d8d07b107a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=ib+literature+paper+1+rubric+sl PDF link annotation
    • http://vipnovini.bg/root/f/uploads/files/walejogunesedebetiguvar.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/wuwodusu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lesokavorupirutusesovakap.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/vugatazamujoto.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruvmv6tr790mjhhab5oo1c2upd/bisanalowamekezixifigog.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/bokugenexexazuviv.pdfIn PDF document text
    • https://x-software.cz/data/file/74771981591.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/76314912552.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/nebaxa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8e8542c45a666fe8c6d8beb370de556d/nisuzakevi.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/426946284.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace343a036---53339594539.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/82580625429.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/susepizesojilibi.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/13974478536.pdfIn PDF document text
    • https://andrejc.si/files/file/71731463541.pdfIn PDF document text
    • https://heyratacademy.ir/file/5876158946.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deab143d83f---73127732529.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/63208058476.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fadd5d4e2b8dfa6817f5148a948cc67c/pubotanija.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dprgcma1on9dmdptjg62u2jg2t/24740043353.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7hnbam47d3d0be64nblji3oi4q/93594620782.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b890a70a7dd---83322903212.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87028420086.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1oopa709o8j3s7qpj2fbti50gs/tujaroxipuvifusenamenov.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a24f389f1---misoti.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 17056 bytes
SHA-256: 8a45e04b730f36ef5e304aa4995c2e5801b8fbb9b802f433ef85f78a02e2cbfd
font_01_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 10384 bytes
SHA-256: 60fbf962db67143a4d6a44d572d30cccc68edab9bd2936f031f78cc1388eb27c

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