Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae95d61381b434d0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 03:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c2b32f9032393518494dad120127265 SHA-1: bf10b8635be90fa8b06ab701eae5a7c1571b0160 SHA-256: ae95d61381b434d079eef4c82feffd9878539122b90de79f8a3f45d0c2e5fc98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the true destination. While no scripts were directly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://soudurelauziere.com/upload/editor/file/pejojinuwupojetixebitu.pdf In PDF document text
    • http://tamlaproject.com/userData/board/file/bodiw.pdfIn PDF document text
    • http://kingnature.ru/files/files/3434959107.pdfIn PDF document text
    • http://goref.ru/files/file/34473297359.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684a7b6bde---rekigonesukixagexubitil.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zopesi.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/96269557865.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/vulom.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612e046d63184---18921843890.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/20989185266.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a74a5762c6973d1c1706065c0badfbfe/xebenafesidagu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nuhsthv5u08v0ukuk2grlftf41/xiratilibajejabamed.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ugbhvu7bfci52cfosee2e8rjl9/42181186574.pdfIn PDF document text
    • http://mosjob.ru/images/file/44050377524.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/wejodiwi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/7521116552.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/buofigc601upvgvd70dl30aon2/74953037634.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/timurebaraxugivavinumeba.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ee5d0475d7599a0636067592e545bf3a/sirepapa.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/26071105656.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zowaxinepe.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/86873181949.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16076777c56434---fikiwigajirudidexodib.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/52434324211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=someone+who+or+thatPDF 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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 18220 bytes
SHA-256: 67b1afed3e470805b80c569bf2f678ddccad27bd023008b32e978a138962abb2
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 10228 bytes
SHA-256: e08de21448c8825b4adf7f54c1dd18876ae0c3951928148553999f86d08a4611