Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb1c09e5aa71a2a…

MALICIOUS

PDF

152.0 KB Created: 2021-09-08 07:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 586d0fc99782ec4939a69895e43daa98 SHA-1: 4467b6b10a53bef872cdc4975f65ee7d270b7f9a SHA-256: dbb1c09e5aa71a2ab375fc999040c554a9a1594f095c2c595aa7079bff2f92f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://be-now.pl/userfiles/file/43646997518.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2854b1a1fd---gevarifuxegimuwemupez.pdf
    • http://tetobox-budapest.hu/uploads/files/31187302315.pdf
    • https://nurea.se/currency/userfiles/file/28444491486.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa03e77dea---weloveteva.pdf
    • https://clubkdo.fr/img/pics/files/bekumozuzubovuja.pdf
    • http://gurukripapublicschool.com/userfiles/file/58491658959.pdf
    • https://highrise.pl/file/99545185269.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/41c066e4921542c629a81a62f8b3aba6/gofotojexeginexeken.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/gudukizazeluxu.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d1e26edd149c131bfbb974b2285811bc/23128898118.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609056eb9dc7b---99934599700.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3780ad79c---50325709936.pdf
    • http://techbis.pl/files/file/sexikodu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3610df851---faborigufezomobifa.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/89740661562.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s02bhcfunctb0866lnro12epda/34863359358.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6676aec567b8fca4f7bec88cfff080d6/57959619838.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404552dece---pomot.pdf
    • https://mides.vn/images/ckeditor/files/bagomadedulozafadogelawug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pancasila+sebagai+etika+politik+dan+ideologi+negara+pdf
    • 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_off0001dabc.bin
d3ab10132e1f6c1280e51bb3c1bafb8a330c4f3e95e1067ff9a2c25fa57918d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DABC 11028 bytes
font_01_sfnt_off0001f41d.bin
5de0da3d6ee71fe7f59d1bb318ff542d4121455a2c5f9136527a5e91cccd7d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F41D 16576 bytes
font_02_sfnt_off00020b7e.bin
d4e5873b62117c1daec9177d57f4e3fc7b64a99360377aab76c352d669d8d451
pdf-font-stream PDF embedded font (sfnt) at offset 0x20B7E 17552 bytes
font_03_sfnt_off000238bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x238BD 16792 bytes