Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a00bd96cad3429…

MALICIOUS

PDF

70.8 KB Created: 2021-08-28 11:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19ed7d2455909d3cb19bda0e9188c14b SHA-1: 8d72ed4199f0074649752cb851485d2dd7230ba2 SHA-256: 81a00bd96cad3429b551cc094ffd2cf4bf76805da07de1c778c7c9d90bc9ff6d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. The embedded URLs suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962947d72a7---jeranolamite.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oo49mco7ajddducidpj4mkdlft/kixekapefotasi.pdfIn PDF document text
    • http://paliukenas.lt/i/File/taxaketiwevirelupefekoz.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/32118693878.pdfIn PDF document text
    • http://chongros.com/userData/board/file/jovodawudadijozuzirodupu.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210530_135352.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210606235512.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d80c045a9---34918878084.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210810100654_5sxz82.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/vaxogenilujudasipod.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccc177cf8a186876a859cf72c4ad1ba5/97988390223.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096561186b5e---38400891688.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/midimaxozugumovebobelejug.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e944abf2620---88269945606.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160894277d9127---kiwogobivetoko.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/wejibidob.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210724234455712.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xudekagasajokin.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/edfaabd4063bbc3667053d0921645b7c/93834685152.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/1405475632.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vewikulavodufakuvu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99dd00324---79366897532.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/go5fsj2k8titlrkbltvgegpbv9/sulunojilime.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/domin.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ae4ffcfd743330bd14535bb66baae630/voniketaj.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2066ec8b52---65345396178.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ffc39163abbd8d986c8ef13351b87c59/devevulowomumunikebifazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apple+cobbler+with+fresh+applesPDF 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_off0000b90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 14296 bytes
SHA-256: cad6392bcc18c0a1b6defd5cb548314b788f33def2bda49f2df97d0da8bb7a92
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10680 bytes
SHA-256: 8f552e1fe3fe0d3e71996b053b0371612f17f8eb310448dd01e93ce23af893da
font_02_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1