Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec8a8005551b2d3…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 08:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c33bb9eb486c690f02e3d3aa9acc0047 SHA-1: b6f62ba29f457e312e86e91d6acbe175760fa7ce SHA-256: 8ec8a8005551b2d3eeba123f34ec7dc2214f9c11d10d61009bcb2aa05fcb4221
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.aadhar-interior.com/userfiles/file/47594073389.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72855609174.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/i8mnpd3aeev4kgbm9o1aqegkfl/49645640522.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4bdkoln67p51f3j6f4s1pra072/39610614693.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/43fc387cf0ea801f7dba0ece1f956403/91763171232.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fgtc1mi09gal1d3h1okvskikl2/74887025013.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/memaf.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/67442975197.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/sopegegonebijigar.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/poxijisemidefe.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab078a5beb9---18896158895.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e0f757a7---vovuzetelofisekavidex.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868744661f2---bivilig.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3d8da99c912168b6300eda71afca4f56/zodufinuzudakot.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/5554074030.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/44717159564.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/26643f5427a568bb813d31f9e922b7e2/rivaturukevu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83dbdcf2e---96566140057.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f07fa6---movosixif.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/30702374089.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/97600318293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=proteins+are+made+up+of+smaller+subunits+calledPDF 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_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 17456 bytes
SHA-256: da41209a5096f13a02103f7f50b81ffd35b7bd52a3d874a5e6607bf1755374b3
font_02_sfnt_off000146f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F6 11020 bytes
SHA-256: 58465dd2284e66b50689537edf95711f3687af6e5d23167c9937eebf297ad418

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