Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b138a814fe24f61…

MALICIOUS

PDF

84.1 KB Created: 2021-07-22 01:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d88d9e3c2e83f3b3739b1c8add6a1b2 SHA-1: 20ffd968db03d6e7d2d8972f5945d7227d1a7675 SHA-256: 7b138a814fe24f61bf2c63f6de75794d7de8fa867e091d4da7214b7074b52a32
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous unknown URLs supports the link farm detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47b0dac26---vawalurimo.pdf In PDF document text
    • https://12waktu.com/contents//files/84767504738.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee681594f3---gemigivebadowepadosubusi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aee6981d283198618b5f0c1a1967ff54/tokevo.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/022129057534.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5ae09736993e9315c61dcda4d75a5d9a/jovobanexabowiwavitapi.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tisirapitibulisowafiwafa.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/woserumonuwidiledezogojej.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b8qeablqo5vcabrfb3f37jfuhc/59180533422.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fuvugopetuvepilupe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/63ichj4316h3mm08i06qi0g8e6/nobivexav.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0b4b25ab---62506177030.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/lrakp6rc66tr92ehgom6s62ln5/52586791782.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c99f4876b3---fubita.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/25714032117.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zusonemurazevi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jerinamijuwas.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9f54c6ca1c81939f8ac05225d235333b/96677038544.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/61451568688.pdfIn PDF document text
    • http://fygl.net/uploads/file/190253531494.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/62511733888.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ir0igcfk8ahmv70p4duduhf6g5/62236171351.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8411e5711---21332361092.pdfIn PDF document text
    • http://charivne.info/images/file/7553780602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=growing+turnip+greens+from+seedPDF 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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10856 bytes
SHA-256: 337b67c76d1de352047b1ff09618f84fd838118d57160a4ecb4ad25ae31be933
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 16736 bytes
SHA-256: 7a968e978ee0c757c4548e9d69f12d15b3b6a5a5827af5ca510e394770e5df1e
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1