Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d33b528146a4add…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 07:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af4f25d999c37999e54c4c849434c2f9 SHA-1: 8136c58b0d2ba73b6f7ab58ab99b7b7ec3d7595b SHA-256: 8d33b528146a4add13ac299fb12752746c3635f6a9882f043edad9cb3eedf46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites and appear to be part of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests it's intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jewfri.kr/files/image/files/7147942869.pdf In PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b209bc9c685e58ce8fb73fceafacbb5/83143017337.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/30381697055.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd93d5ae7f---14808805531.pdfIn PDF document text
    • http://darec.sk/files/files/71587724036.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/83992666094.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/46068392313.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6190144ed---93798402698.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2cce520c2---34756079000.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/gakagadijo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0nt4frm52791v4iemn6mi7d9pd/44220778146.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/6829891506.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3180ce7a47f7a36b284810454c88d2f8/99462302059.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/96538561070.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729e946e94a---mazozurobudaxejax.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb3045a71---jejunivuvozopozi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/vigimiramefitagexasa.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/39746934272.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/46394743473.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2465821482.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f00e79c90da95b1721050297fe3d647c/mexikizonuteran.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/32801076564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+mine+asteroids+in+elite+dangerousPDF 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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 10768 bytes
SHA-256: b3140a51decd0d58ac5b73da3090beab4f5537c59d180b8c5102a4e3bde2b0ab
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 18400 bytes
SHA-256: 2002f056650ec99b558a246f56ee552f9a7ec00ca0bc480efbe7c49f54d11624

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