Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba300451a11a9fd0…

MALICIOUS

PDF

159.5 KB Created: 2021-07-02 01:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e29ab2e4db763cb2b199cf2e709d841 SHA-1: 18a8891aa7abcaf6bfe3e9992556c5d7d5ba14a4 SHA-256: ba300451a11a9fd07f6dd77d0f76a3f211f0c056d643f9eb9f79cea9c173357a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9480

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=so+whatever+meaning
    • http://northcity.rs/slike/files/tuxiduwovobepabibofe.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/01e3ee68e6e25ff878193e1b158d8746/429693198.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/953a114876260e7d96070cb3c119d27f/modigaf.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/aa70ut5l8rov0lsf6i6pbt9cs5/52468800554.pdf
    • http://onnetsolution.in/userfiles/file/35193342658.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8eed4d3c---13707493235.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/24241343326.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b35c611b0b50c97f7118ce014d0e7ae4/dotezuvidug.pdf
    • http://abwlargo.com/uploads/files/besonipe.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/42b3e0fd234689878828463589ac4454/51726733460.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609febea38d62---sikezidurakokonajibeg.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hhhrh1gbqsgha136rmsgjfbgs7/xafigofudubibufojebopuke.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/25290906540.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bae1992a3---jagopagenakinogu.pdf
    • http://charivne.info/images/file/fezogi.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b053060c6e---vazoniradudupubiraw.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210617111512.pdf
    • http://amsaneeraus.fi/userfiles/files/89756831780.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/28282946703.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a34698dc1---pazepugusefarigaxak.pdf
    • https://eobliecky.sk/userfiles/file/kepopekobuzamewedipizim.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/cd6f2de9df8f5e91bdb15a7f1b49834e/22343709538.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000234c0.bin
26d8f819e78058c7316014c3ee24e59645f76a7bda2f8e7744d28f85ea611288		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x234C0 31556 bytes
font_00_sfnt_off00016655.bin
2bf89af9aa25a32a94c7aea368947353b69a98d76c0700a6d16911158a537a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16655 10568 bytes
font_01_sfnt_off00017e56.bin
f63f2c6b5d2dae92dcbbb2851d76717b853212f3ab93c1c510bc30bb4a9a8762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E56 27564 bytes
font_02_sfnt_off0001cbf0.bin
63307ee2859d3dcbb21819376ac6ca65825bc821e7bbb3d255ca2f664cba253e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBF0 37628 bytes
font_03_sfnt_off00021caf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21CAF 16792 bytes

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