Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e092d53351793b3…

MALICIOUS

PDF

99.9 KB Created: 2021-08-21 05:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1661da733fed33676d7a2fdf5ba3df50 SHA-1: b06b782ef5b49619d76cdc8fc874d6843cf8626c SHA-256: 3e092d53351793b3a6270bb437e3c74451321baa7f98f73e6dc71ed8bf45d874
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.playitdirect.ca/ckfinder/uploadfiles/files/29629896820.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/40242337801.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wosumabowaxemomom.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/jexojumenonogape.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/7477108584.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/zejodapajipudegipis.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/63253018269.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160863146ef2ca---gorajojadutolimexe.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/29419661437.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/vevaxog.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110ea4a0f50e---49615641904.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/rujunojizejaji.pdfIn PDF document text
    • http://mesterek.net/tmp/52395165967.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a685eaecd2b---88431221661.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502005620697353.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/khr87k9v031ld08do1k08d5u9k/18745412225.pdfIn PDF document text
    • https://luminex.pl/upload/file/posudazevewomogomaja.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19643c8fb---safukajaguzasamovi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8103ddfa041594332160b3eb811faa23/guguzatoxebibuze.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae5834a222---56729785193.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/74530638789.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/58076281799.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611667ac13a49---97950341674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+studio+show+gradle+consolePDF link annotation
    • 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_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 10816 bytes
SHA-256: 54a4bdece14224e6abdaa42086643eec1014da80ca227382758f502b9f64eaaa
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 17476 bytes
SHA-256: 5b58724b4010a0ba8ff68f4205c4c0bca35e15d5d6379b62627ba7e42e7ec743

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