Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b30f0dd28ef2b0…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ce0729e3aaf3260fe06f96fcd2e3c63 SHA-1: 729529eb00464bedad5abdb75d7bb1a1e0b2ce27 SHA-256: f2b30f0dd28ef2b0a638a5d7628caee26c1fd83a0169d5e957e5212d991c8b02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites, which in turn serve PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic where users are instructed to provide a password for an archive, likely to bypass gateway scanning and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/665375d1c32ff3d5f8eb29f43900f9d9/40273802295.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160de72e589542---87942740353.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e72d80360---265535344.pdfIn PDF document text
    • http://abc-tel.ru/data/File/girifagaxuxewiwijejufap.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/50155968473.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/3671097432.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a8cc5c794aeba7ecc236ebcecca0662c/77481306099.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/54196124691.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/36601609459.pdfIn PDF document text
    • https://parfumzone.ro/files/file/munegimefufixoxajos.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ad77059a8b19187ef4ed1231bf1e9924/duxugesomijewelenoje.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/51lik8s377kgmguga88igtsk2l/57606770137.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m2lg8si58mou3m2hdr20l140g0/92480229861.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/99058038834.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/32328013.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/94836266194.pdfIn PDF document text
    • https://basisangka.com/contents//files/pefubilomokiputubo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/ripazomufor.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7culscjujfg3pcin7rh5h5no72/jizimesuzirovatumidanudat.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/51027270448.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hfftn1j008d0eg1uebi0a2nljh/45717283919.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/32036886148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2018+telugu+movie+video+songs+download+mp4PDF 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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 11372 bytes
SHA-256: a2ed57d770bada5d5fae9885926d64ac21ee1bf63377d47f9c44b40504438801
font_01_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 17932 bytes
SHA-256: dfef540241a08cb1b144c91edb8f9b51c6e87f69ebb9fd9dfdf8f8bbaf48ddef
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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