Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb55f49129b84cb8…

MALICIOUS

PDF

92.0 KB Created: 2021-07-29 21:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f0b6244c4ac1b8e074355b83b535e68 SHA-1: 34ab4e705a2ddbd06190928bcad498734602bc97 SHA-256: cb55f49129b84cb80b5fc2a1d4d85afd7090167f8f01eae5e637d562c4b3edef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the overall detection profile strongly suggest this PDF is used as a lure to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0981de991---jikofupamotuwadapep.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210525/file/16218855988686.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/796000edb4828979f35fe68336c2f644/fazaj.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/47177456752.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/65893152537.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fipanafujoruluwer.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lorogazimitomazowis.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fubazukudigawumurogajan.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c432526d96003f67beca71e6c9ad4572/35899778053.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/27809180999.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/59388db37b115a0d9970536ad982c6aa/61261758903.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bfad69e41ad5d3398a21d517a13f666c/tetoxujasalifobaweditu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mezidudujejasani.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vcojjb0lo5qbl39cg7h2sd7ks/1119534946.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nuwasuwiludurukukibiduz.pdfIn PDF document text
    • http://splogservice.ru/content/file/bolufunimagilategalenoto.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b86563eb12037ff8cedc8395dd0bcc93/misazarotive.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4f8e6192---48113785686.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/paxedukiwozunavabitaze.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/98173441895.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/25912550718.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gkukfsgpebdj5f253788tuq0ja/78408543716.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/funetagov.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54b01337c---madolufidulano.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f113f05f4---30059516522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+calculate+men%27s+underwear+sizePDF 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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 17624 bytes
SHA-256: b5d335abecbd6d1c444e6364f2621a229915bdc828fc02fd922a8919e4dcbc06
font_02_sfnt_off00014750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14750 10800 bytes
SHA-256: 208a78375bfbdd78362e07e075e508f49c2ee9e9ed63be9213c5fb7a7a5309ae

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