Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c021ddb47facab…

MALICIOUS

PDF

88.4 KB Created: 2021-07-03 22:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae6eee87bb9f3b6d1489568520a16235 SHA-1: b31587fae5dec7e439e5c4efecbc025047984530 SHA-256: f5c021ddb47facab7233f6beae8fb56361ef0c53e698aa3db921ef51bef086e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or hosted on disposable domains. The primary purpose seems to be directing users to external resources, likely for malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=polygon+of+15+sides
    • http://aggengr.com/uploads/CMS/file/61224316750.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fewujadupuzapi.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdcb69f04f---13421984250.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607372d7a7307---malelavadowozare.pdf
    • http://nhs1980alumni.com/clients/878257/File/busarilizobufez.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/soselulabukorexapu.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/11591136743.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086fd6e99a---komidagema.pdf
    • http://www.addvanceo.info/userfiles/files/55698894269.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vkt3fn6cdqv7r2t5dasplak9h3/69442318049.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcfa118d0---97640374063.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b166cc7339d---26397821663.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2676c1f100da2a600b25071ea70ae430/28131272114.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a8519edea3acb81ab10ddbf4f109abd6/1137541469.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6d67b18e---95699909057.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b769ae37---39064406318.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be78326262a---21826004706.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2onk3jlka4a4lp9bbjhra6eb17/tuwupavefawobonobotani.pdf
    • http://zonazero.es/userfiles/file/jibig.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66827004b---40878054588.pdf
    • http://creptiles.dk/userfiles/file/gewenafodide.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/jugirobukerusepo.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/57212075612.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67a8667ed---25649521983.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ed.bin
1e66acca3fb201cbc87f669dedee4a9c261404dc89445cc00b8c323721ed661b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 19156 bytes
font_01_sfnt_off0001240c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes
font_02_sfnt_off00013c23.bin
343c1ff5b4fa2b9f93b828150dc7b21a48edfa87ee35156ebb304eda208750e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 10468 bytes