Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08e0d07fc4c85bb…

MALICIOUS

PDF

107.5 KB Created: 2021-06-25 20:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 987ea44d079d6540a45ddb1cfaa4f860 SHA-1: fa4e0117693b1ee80307a223754ae0ead6bfa16e SHA-256: a08e0d07fc4c85bb00eeea2a4e4cf64cad603745483188c31655e7578fcb39c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://bortran.com/upload/image/file/20210610062202.pdf
    • http://castrolmintabolt.hu/images/upload/file/wibojuparenibazazaxij.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/7b4b104901387adb1c6144c037a763db/15301251083.pdf
    • http://orchid-daikanyama.com/userfiles/file/xarasanakava.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b91cdf0657668f97959f1d85c6d1db40/47425423705.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b0d3f24a---gesemoledexat.pdf
    • https://addsfly.com/userfiles/file/vexeniwa.pdf
    • https://marljivo.hr/UserFiles/files/53763553560.pdf
    • http://billedbutikken.dk/articlefiles/file/jakenomatapesoxemefeje.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0374a5231a80c45f55398d6b1fed9ca8/70669367654.pdf
    • https://hmanagement.net/userfiles/file/kavadeva.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2e743b7f---60642451251.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1bda35b1ae2350516caa9c47388b990d/wetopufesowewopixob.pdf
    • https://aspirans.com/files/file/99123717868.pdf
    • http://inspirationforexcellence.com/clients/66491/File/18936783671.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080999b8df3e---losorub.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f1be66069010ef60714b956525a58df5/suzupunaraloji.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mt3fs0h5l9e1aemocqa3b206c0/vumirofumunegazotonek.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f7e848c2---55828114682.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1b6bbbb8a27e8fe2c9c79d75fa3a3a69/29244326720.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a906a15a8a4---kawipajedisuwetuwonisapij.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608073c38c086---18117516881.pdf
    • http://architettotoma.it/userfiles/files/zezadiwitaze.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/07dc11fe3f9d2e120a5251d5eddf1a1c/40625156981.pdf
    • https://easy2ticket.com/upload/files/55528886384.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=yes+to+same+sex+marriage+essay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ba4.bin
16304e073e480740953d0046574613fbbae183949c6d6a062bfdf44b85ae11a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 10500 bytes
font_01_sfnt_off00014399.bin
eba06d69a8a0b8d7b22ca884ce79c07a26b0de85c05f1a7d03022661dcbe4a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 17916 bytes
font_02_sfnt_off000171c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x171C7 16792 bytes
font_03_sfnt_off000189d8.bin
b55d9580a7bee2cb602f41d62f8125d2cbe94729a400dcfa7e5340602bae0b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x189D8 16300 bytes