Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1b772ccb594e54…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 21:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c455edd8febb09f2d5ea902b80d3a24b SHA-1: c50dcafbfa4f0e6bccdec7fe4c4bd465eae7fedd SHA-256: 4d1b772ccb594e545b4715916b8b51a2960e72189ac16b4747fe522107ad4344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hurtowniagrafit.pl/userfiles/file/zawifadajeb.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fef86a8c9---93440836436.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd16d74ea---virojarejijuradamewerax.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf18aa1bf0---85216714661.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073203d19224---kibev.pdf
    • https://anmimar.com/royal/userfiles/file/beripofaril.pdf
    • http://skogsformedling.se/bilder_umeny/File/51538397910.pdf
    • http://kursadowicz.pl/Upload/file/vogonev.pdf
    • http://abwplazaview.com/uploads/files/17686905549.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/95880876313.pdf
    • http://urduhadith.org/survey/userfiles/files/90910368969.pdf
    • https://jagamimpi.org/contents//files/81270954235.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cdc456836203ae1f01e4f86d34cf17c1/bitisufaxexi.pdf
    • http://libertyquad72.fr/userfiles/file/geselapawurino.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6ad31caaea0c113000516a5618bbd19b/patupufanerawajano.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f8d34de623ea046e524ec861c0416696/rofibilovutufariviginexin.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e1a2b4cfc9f7fb0fa752a5b24a856ed/ritalojew.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e03e6fbe7---81568288103.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0267ceb3ae---21247311469.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086998b9a695---xemuluwaromibof.pdf
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/010942b6522f9c56712113ea6d4315fc/79404813262.pdf
    • http://architettoangeli.it/userfiles/files/62586925193.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/kaqtqvufseja720a8f0jp0goj3/zixox.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/18934866224.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=i+heard+my+baby+cry+in+the+womb
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97a.bin
21d4c73eedca9e33cf3ce7217543cc9f7a08c624138eb93675625d1ba8ea43bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10712 bytes
font_01_sfnt_off000111ee.bin
d4beef40d5e8063bc141384f6e6a09aaa318701e9ded179a047e6b02c0995173
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16804 bytes
font_02_sfnt_off00013d61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes