Malicious PDF — malware analysis report

Static analysis result for SHA-256 79223dcf51decc8c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 18:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e798f3f5323787b946c25234a841986 SHA-1: 99728ff1447a8f0d8dc507db2f528cae9d120951 SHA-256: 79223dcf51decc8c84b1e26d1e249551ffc3dc434210d5ebb9730c9bf49f30d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=apa+how+to+cite+pictures+from+internet PDF link annotation
    • http://srmtteaparty.com/uploads/files/202109190633545744.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/bomugubogakarosopugota.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/wakodopimiz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f6b934c1---najajitegotenabaku.pdfIn PDF document text
    • http://kodemari.info/data/files/68195713359.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e5ce1022f3f72850881af653e1edfef9/dunitopenenebulabo.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/losajuralorutubapow.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/tulivuke.pdfIn PDF document text
    • http://floramarble.com/uploads/kazat.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/13790344006.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/lifig.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/31111317205.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bokurezu.pdfIn PDF document text
    • http://nova-auto.com/upload/31183330206.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/damibovodekomujuropufe.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/godepisewube.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/dipivinujazejosuk.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/14235069802.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d7e7db100---23588275563.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/f652m3nlfn07kqfsdenvpcd8v1/lumupojesenototo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/blitdin571qdne74hnc671qmc2/gagofilagofonufixaja.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/fivusifodipisa.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910082152_y6c2me.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee44c8963---ludipu.pdfIn PDF document text
    • 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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 10868 bytes
SHA-256: 39f22dfbaea7bceaab636b70afb32e4ef61a0309f23f2150a4f804c19bbf3ff4
font_01_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 16640 bytes
SHA-256: 0ab378f6526151a0dc646a1717fd9c607ce922c2a740ecc56ec5e93e7d74fb03
font_02_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1