Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cc915081eed57…

MALICIOUS

PDF

91.2 KB Created: 2021-07-07 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57e97b6d5efc147af1a7659e1e94c758 SHA-1: 9d722795bcf23a5315382ae56b926996cd2eb969 SHA-256: a67cc915081eed5735b2c994ebf8632a1e16fea7621b61d0ce5e67e35a7db678
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent through the use of compromised hosting for PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/13011991bdf58d8d0eccaa718eefe95e/bavebapefamoxerigid.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea918d25f0---zosoxoregapimilitepu.pdfIn PDF document text
    • https://chpcentre.com/files/file/pujazipijawidaleduf.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/15593516761.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/terevawofexulejig.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0b939392128b1c393d8d631a4db8261f/2856417297.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/10209843037.pdfIn PDF document text
    • http://come2menorca.com/images/file/zuzewofusuje.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgbgtpt5lln98jjmfgk1ujdpe6/xesilatonijomizejamakevi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cvu1b4bipghd4lko06jklki3lo/52151602801.pdfIn PDF document text
    • http://abc-tel.ru/data/File/24828714804.pdfIn PDF document text
    • http://kfbi.ru/content/file/16817831837.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d801fb74fca---26852769844.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5fd16ee0---vekep.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/05121bb341c8aab9d1c6654691e23153/4826972643.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c8865c28940---tenatuwajedoma.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/81488819742.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2278cf97669803a5058bfa51ae099d59/wadixetivoz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qn61fvcn0hckacl8mm4rmagbg0/25592932982.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/70961662247.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/be45229da763c822a578a9425b579708/49294641042.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/45408895852.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/najixojad.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6c9a25f4---70148097240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=artisan+riding+cost+wowPDF 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_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 10436 bytes
SHA-256: 9a6987f22b67df8dde275bd49cf77708f4fba56a52a9fc335e8c96c1af5ed3d6
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 17940 bytes
SHA-256: 1013a7d70529bb65b8dddb39a5cbd8e838e0cb1a5a226ad8ba676be7c1ea6e9b

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