Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ca98b0111ba36f…

MALICIOUS

PDF

73.4 KB Created: 2021-10-06 16:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57748683e98d4db126d632785107f76b SHA-1: 6dd831a78bdd7fdb757edfe92282cb17a05fce9f SHA-256: 43ca98b0111ba36fd7f57d20b786939ba1a16a5e8e7caeb7efbcfe864730094a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://artsar.pl/userfiles/file/24490796042.pdf
    • https://profitaler.com/UserFiles/file/fobogikuwadokamudojerufiw.pdf
    • http://nikolalepojevic5.com/multimedia/file/legusokajejemedaliz.pdf
    • http://ekvatorbl.com/userfiles/file/61903747141.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdf
    • http://slsnn.ru/content/files/zesuk.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20211005/0512018420.pdf
    • https://elnativocoffee.com/silver/upload/files/13897653809.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j4f0g6kmm0908i6n775nkcnnj7/82330319293.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/tusamumupor.pdf
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/zapalobakibiwapigeniji.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/53740653548.pdf
    • http://ituor.ir/basefile/chartermeinfo/files/55910790501.pdf
    • http://huijingweb.com/upload_fck/file/2021-9-16/20210916230256862375.pdf
    • https://aqua2go.pl/galeria/file/38195306009.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a1ac143c7f957912269a394dffa95708/82143631435.pdf
    • http://ajisushionline.com/uploads/files/rukuvogidekek.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/npfcrsr7hk5lu16r28nth2jda2/muwer.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/zatasufibitadara.pdf
    • http://sun-tes.ru/files/file/9412261589.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=testamentary+will+example
    • 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_off0000bc44.bin
3d637eeab68b969ed149252b8b5643f6349b7beb58bd80c89147ede8cbbb0423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC44 17244 bytes
font_01_sfnt_off0000e820.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
font_02_sfnt_off00010037.bin
e57f7ef204be8ca5a51eaa9213914b4ffbc11e7c90382b687af9419b5cc24914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10560 bytes

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