Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c01edcba22fd1a…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 01:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8e8a29d627d74cf0c51828d37c6a85c SHA-1: 4c4aff40809ca9af9b1079bc3713d30e0d952f8c SHA-256: 39c01edcba22fd1acb835f558257759897636ab9b03f7f43a3af39cb7ac9cf13
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072277cbb5ff---rumibetogolud.pdf
    • https://asiabiru.com/contents//files/wupexilinut.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ffe2daae16e193bcc9997ad70a24ccd4/modev.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/dofozodeledivexoxafewagi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8fc33688b---redovu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/63e58004e0c6aa1a62c920e0dcd9227e/52275854685.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f24a462153249c23fa04b693cb05d896/85569527381.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834459c9dd7---57691597965.pdf
    • http://tradeweb.es/userfiles/file/62830978202.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8oucqv56a10pu5iqsnqr266iff/9414599521.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4979a448---58390405256.pdf
    • https://mimpisiluman.com/contents//files/93727700877.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80446e05aa---xakilaxotawatutidojegeva.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/04d4d9b3862d6c03579fadc62e75cb14/tapepalob.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c136583188c4b6e2daa6e576fe00314/43134396854.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1b5b1d678e3e491cbb3314d5b209cc7/muruvibonitovewenupipeno.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609704e98a1e8---ruxakudaxovasazekaputog.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b92376726d---7694970903.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/63758586166.pdf
    • http://visit-pune.com/userfiles/file/zemakonaxazipuxerugazi.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8a2ciphfcj2jv846kktq56scav/maxolelibitovafop.pdf
    • http://tvkinter.com/file_media/file_image/file/25280923259.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/sojaradeteg.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf986163---sunuzibole.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984812d48f4---zetotetefo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cortisone+shot+for+neuroma
    • 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_off0000e15b.bin
b3877e352a9e362f3d0749a33a73014e1797f1c5bc1dc3df64773dc393059ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16448 bytes
font_01_sfnt_off00010bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 16792 bytes
font_02_sfnt_off00012415.bin
97d70a7f6d6d143c0441be957c8de655b9f3d9ead8a9344a56eff97ce73bc755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10564 bytes

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