Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6f49bc5bf6cf89…

MALICIOUS

PDF

81.0 KB Created: 2021-07-13 22:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f250195f5b2c2ae82da7ecc8da0f7722 SHA-1: f372575f80447672938f90511894c82afd721084 SHA-256: 6f6f49bc5bf6cf891f992fe314f21875d30c382a5dd941b45fee3932061bbb2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://parklanehotel.asia/userfiles/file/39244822715.pdf
    • http://marta-galan.com/files/varios/file/dupalolexudog.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/54559bc7836f95afb802e13b23c4e1dd/visewarigalefafuju.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/wakajas.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2d01e588d152eff813cc35559d474cca/8981025019.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/beduvulup.pdf
    • http://gesundimjob.at/images/content/files/topividigat.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bovodanidajube.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160df8a810456e---zumikewibimakadan.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691323ef7e---vezawum.pdf
    • http://elskenecologie.nl/files/48912774841.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0c3ab920---popinesuzufubimid.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/tuzabifufimijotefijigifif.pdf
    • http://naturallabs.de/userfiles/file/govetifo.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6481b1a861fb86fc304038d77a0bc624/lolofuweruv.pdf
    • http://b-solutions.net/userfiles/file/75222658523.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/09797bd3lbspsa3e4os14ebr6p/67227493917.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b5dc37bbf39e9d6b07009f5df289830b/92662711678.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72e282bad---35334341760.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084195913b65---fewamisirepajarezarivut.pdf
    • https://cleaner.pl/userfiles/file/femoxesiromoma.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8414f47ea6d3cc69342db88b71e78495/zilavazotaxarixo.pdf
    • http://automsystem.com/UploadFile/file/20210714023227186.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094089eeabb5---fubosasuresutisi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=time+word+problems+for+grade+4
    • 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_off0000da12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
font_01_sfnt_off0000f229.bin
c5e607d3e4c05f0ea4025e3a88f69fce55df8c1ae39fd42b159409007ad50b07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10908 bytes
font_02_sfnt_off00010b08.bin
ff7bf096e4c9e19b7f526f6564b8e66b4600572887839be6c019b01fc87fc7e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16928 bytes