Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3381e554a46311…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3eca722741a366bd193112bed4b95a22 SHA-1: c1c88ec7ad4ba47e5f76103810e02b565a485635 SHA-256: bf3381e554a46311fc1c0933a137a1f66460c5afec04622666f025a6beb8512c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely leveraging a PDF exploit or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://protum.se/file/87980498407.pdf In PDF document text
    • http://healingtown.org/userData/board/file/judapojelikimesujupegeg.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zuzalajixafefinewifiveg.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b5899051afdd37fa4ac58969feec18c/sorafobitajezamiwi.pdfIn PDF document text
    • https://domilot.com/uploader/files/puzanone.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/coqed678bs2a96at6ucgjng581/vurulaxidenutamixipesax.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/wogawikopowe.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/52759749587.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/kowopo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/89720162535.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/7307327718.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/91298927756.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/pojogomedapiva.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pobepuvibuzafotuvojolu.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/rutagigilejanagupaxilel.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/42774666658.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/gotilogabo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e25962904---27993712318.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/41ebc196a66f83b2ba8f6f52b1061aa6/45312735661.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/gevakifevetovesiriben.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/91f31eba60e9fe7d33f6e506fffa1414/38506668729.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/jinijokarurugawu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/zitumilaperupale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=8th+edition+necron+codex+pdfPDF 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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 20008 bytes
SHA-256: f454be5f452840823e513dd397e26675345ec62fd0efa2f9917b5244c608cb0f
font_02_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10552 bytes
SHA-256: 85826c68e12102c629dfb3ec5cf57a5484b4ae70cb4a87005caafa8f87509995

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