Malicious PDF — malware analysis report

Static analysis result for SHA-256 b893337c42193bca…

MALICIOUS

PDF

78.7 KB Created: 2021-08-21 04:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddc7c5bca375ae2f29ae44bee8c9a1e2 SHA-1: 28f2a5c59074edf1c2da02e5eb2eee76ce10a352 SHA-256: b893337c42193bca1c805846bbd0f7cec73493cedf1c075c1f129d60fe4b8678
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and potentially other disposable hosting sites. The presence of embedded URLs and the structure suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yesilderecine.com/admin/editor_resim/file/19835153986.pdf In PDF document text
    • http://dtcguild.org/clients/80367/File/28065378203.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vekugawewupasog.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bd01e4722---xufupuwaxazetuvi.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/51811376518.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97703eb16---44478787638.pdfPDF link annotation
    • http://lateonsettay-sachs.org/userfiles/file/texidogugodafexadelo.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/dexaburazumeso.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/47793062970.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/35jk1hq1rmmktithqmqodib2u0/5246550013.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/vinomonoso.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ele7u353kj1jgsmtv48c5m7df3/60209751324.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/67973118790.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-25/20210525044941698653.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee22419b2fb---40711825771.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d71c25860---45213371958.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0911a65e77c820dc98fe500e10a21372/97633836874.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/ribapewabonaweku.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa50a83dc8---meriv.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/830b4ef7d2569cea30de8ab5aa1609e2/57493868454.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/52925620010.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/antgrs9rck8803569vkn21k4c2/kalox.pdfIn PDF document text
    • http://huntland.hu/upload/file/27236065214.pdfIn PDF document text
    • http://tipiland.net/upload/file/juboxab.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210708_E338FA5943C1D3D1.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60bbc6a591a4e.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=spartacus+1080p+t%C3%BCrk%C3%A7e+dublaj+izlePDF 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_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 11652 bytes
SHA-256: 91d2a92bccd83dd8ed88eebbf401cdac0bf1b595cf818ab663cb216536f2cc17
font_01_sfnt_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 17352 bytes
SHA-256: 43093a0136b720d2e7a6cb3bf9474cb1b4662d1b47b31e6199077d0640579448
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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