Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b187bf8d5e38cb2…

MALICIOUS

PDF

77.7 KB Created: 2021-07-28 03:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 986a9c54f6ba067a16f4f6fb46b7ef1d SHA-1: 212f5c692ac2168a7b936dc4549951564f5f9a48 SHA-256: 2b187bf8d5e38cb24bb2f18ee298953cafbcf4d723d13ede94b90f0e81433f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of link farm heuristics and compromised URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://contrast.no/ckfinder/userfiles/files/9670205350.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af84b66f20---gijeruf.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ctcobo7h1srjsrc2smscjr3j03/piseterajifudirakumu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8fadf27571323fee8281fd4b6f44f75f/meforixetuwe.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/85198283311.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7ba20de9458267513864afaf8f5f2712/mebubositobefuloxebera.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a37db3c8dfbdf05a6d9716475bb57b1/dezolu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a1l84gcrvd9gf2ugp88jdnr66e/90562721789.pdfIn PDF document text
    • http://patroha.hu/file/wopozonirifonur.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/demamufiw.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/63324329615.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sejikeganisuraximotizin.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/59652523471.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/kov1q33jjoa9t57eh572mrefh0/xafezowekikikef.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/dunojuvapetiker.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jomadoxonatopotutofumulug.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283b777b14---gujolotez.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/e04e6c5bde5ddb0dfb60ab089017be7d.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jarodarunudiwomojixedila.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2c2bb5502de6b903e4c1608c9960a515/9488151715.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2b1118b1---mawomeluwenugupinade.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/smh3b5p42pon9gogig6ljftrks/fupevomugafobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nonton+online+drama+cambrian+period+sub+indoPDF 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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16320 bytes
SHA-256: be3caa170c11f45eec4b4805872420a99a63c26c091b5efa97e29702c811ffff
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 10892 bytes
SHA-256: 63210cdfe1029f3e7eefb909ee76664d7a0faa95ee35d047c4a25dfac25aee7f
font_02_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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