Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa56fb92e50cd6b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 00:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd8f2f82de3c0c8ed76241201cded53f SHA-1: c1e1c6faec8b9a6dc78b7f5ac35b30564977504b SHA-256: 2aa56fb92e50cd6b81cf5a2521d8780917426e57915af47c702398bf82c90012
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=epithelial+tissues+pdf PDF link annotation
    • http://cestovni-postylka.eu/userfiles/file/80084896236.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ac73e1b3---7869090619.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/38e88f180be902b71f774871dd3b056b/945241679.pdfIn PDF document text
    • http://webbuilders.com/files/file/26614662197.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/lusetewopejozatufa.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287268897d---midoxajaleni.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/panekadonevemokedonurixe.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://erdivigado.hu/userkepek/file/lebovoxexavavarur.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fenaremejaranomudurur.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdce1b2c3b3---30985313312.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qe2imqcfkf968d9gbakb9c30d3/junexibupofesididovetor.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jeloxipozupivigadu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec81d11294---ginonogojemekudo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/502cdfcd121b212c2eed23ade98b2a83/liletorag.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/tolejotifoxemelu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/77744518424.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210704_D2165BBEFCDAA706.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/49858095303.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774f4216063---zipijigovigunibape.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/vegabilowezurisopefuvepel.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/firagonozefisibipezu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/36012007512.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/gakuledobemoguzebuxivixem.pdfIn PDF document text
    • http://aimic.com/userfiles/file/91676317417.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 18028 bytes
SHA-256: a78ed9639ab64ed5d704fb7f3f3e73c31fe4bba620b73856ba1a3478485c88c4
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 10356 bytes
SHA-256: f308476d540012f008dab987d57c1f37dc48c1ef627418ec52127ed073a94e21
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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