Malicious PDF — malware analysis report

Static analysis result for SHA-256 988c8c01fe018f40…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 21:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b111b1b4ad816e703c97bb00e7a413f2 SHA-1: ccfcefcd4c6ce0fa75ef3bec352b18113503105b SHA-256: 988c8c01fe018f40a6cc449a5f644214afb8a9fb16e7adc2c0e3438721f4dffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=political+ideologies+by+andrew+heywood+pdf PDF link annotation
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5f058ac5656474cd2de305e57043de47/gapemegizedamumesetak.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea2b5d774---tewudosunube.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/04a8669025f136d5c756f470ca827190/50270710820.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/13021732290.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859dc74f7e9---21442215525.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/21725391028.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00ef5ebf5b3e56ba5aa7901cce0b549a/29273760741.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/51793227613.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/jokizizo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/57294676035.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/dagidojebuxoxeniwez.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/73d9293a89be9cc8428ec5c4001f8a5f/tefir.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba711bcd79---78190060395.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lezudegikewib.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/95616282477.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/21885849037.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160816634c7fc6---xemagolarozamovapix.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210715_1761A5D826EBF86D.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/32755301096.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/voretobarenefatadoxibuk.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607241c7e9c3c---navabejaxemixum.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d870105bfb180ce6b26768c12cb0e83d/defasa.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/77426503115.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/77301539452.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/18855908d3fbcba077048e8677baa13a/79363938788.pdfIn PDF document text
    • 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 11240 bytes
SHA-256: 787e9a284c38915073e4b7677be6aca6582e48063594ad7647f45225e89c19a4
font_02_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 15204 bytes
SHA-256: 1b0e92f8fff477cf2abe07602291d2184be9c5c80cfa00087a0785351fface32

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