Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a34c1054637de3…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 14:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff6371d448b72ecb07c97e44024ab9d2 SHA-1: af60b0919adbe2a4e47c2569bd09268cf97026f3 SHA-256: 25a34c1054637de356cad3b88636867748af5c9ad1f0f7bf5be5fc73ca341105
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links and the overall detection profile strongly suggest a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06947166d---fobejisadudup.pdf In PDF document text
    • http://granite1962.com/clients/869125/File/50609290195.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/43503380974.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d883b60---zipudekilomirewomadopob.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/poxafakaxojopaz.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/58044814317.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/66300762432.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wujepinitarujimesabefoto.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c237fd372b88b54c6441e8311d2efc27/mibiw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d0219bf---difikimobidozupimodidorud.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/zixususuzojukatoruwaneris.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/51198059476.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/desuxu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/eaf5f300f5c4b20054037a50f2d1c923/20888064045.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210905042507.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/463daf1f290a805ea9b85024a3ad6723/75405502918.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9da4a4ab788b5c0da0c49a775e114be2/jagewidefawidad.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9f1f0d6a---xotinubiximesivuzidebuxav.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fd0ec6cfd16cca5dd89cad4877f4fb77/xuxetaligerutude.pdfIn PDF document text
    • https://digireg.pl/upload/womiresiteli.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210719_37000C8E5E2F7854.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/72282732868.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/vokerazuxafetewujapobi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87747455098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gulamgiri+book+pdf+free+download+marathiPDF 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_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 11232 bytes
SHA-256: ecf0ca2fc86c1db68ba80231a475dde59e0fef30af645964db58a776d52fd378
font_01_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 19680 bytes
SHA-256: 5ad73b49fafe6a71ef38cdebe0aa92324f8f7d612dbcd9b1053b18639b048ce6
font_02_sfnt_off00015772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1