Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf053e05c0196de…

MALICIOUS

PDF

82.9 KB Created: 2021-08-21 03:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f102fe5825180adedbcdf3af635fe24f SHA-1: 8455bb582bd984e1a489c9ee67daa667f3e5f1df SHA-256: fdf053e05c0196de6e4e3a54482752bde88a47bd6ad2995c41e07b2c48c8b2f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload storage. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://dunajecbiala.pl/upload/File/sexokikok.pdf In PDF document text
    • https://daaeportrett.no/upload/file/49816897134.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38edc7febe---28650758258.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7ecbf39f151fa5ef3671fc9e8d9ce5bd/84049540121.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/33774973242.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/27635576790.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/76458842417.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/69246032085.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/gixawog.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/95072220348.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///64349434601.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/9036583001.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210720_433B5777E753222B.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/wejugebilelobapinane.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-8/20210808075743383320.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zoluliwogix.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b01a4c76f---pasovonitibefeniwamos.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83ddd26c4---98144225498.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/59224178486.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e353958b6---pajunigodas.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210712092723.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/belaxiwapojorakaguge.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sv814pi1ip8id6mhk16s1c754r/visopulikimepanaseni.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/96915093874.pdfIn PDF document text
    • http://sccsfz.org/upload/sizikek.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/16863131894.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/55726353615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ya+no+eres+pan+y+vino+acordes+para+tecladoPDF 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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 18728 bytes
SHA-256: 94f791afe6313a887d57c65d2588a5eb7bb7e76e77ef680c375d61e8e0952316
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10668 bytes
SHA-256: d951029b91904bb5efd3430c06818777d05a25885f14fa69592ee8dce1ada06e

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