Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab04e6932595c8e7…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 43c98325932f365da1dbc313790001df SHA-1: 2d7b1718aec0a4f730e55608df78d0d46bea326e SHA-256: ab04e6932595c8e74d5980ca810c13e43b084412a83d521c18029f19c7ea3ddd
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 a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple compromised hosts and disposable hosting patterns reinforces the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a72be8d5e---68341485641.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/47097585337.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210506182235.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/83222507769.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fb9d0410029379b8ccb2a55d167a1a6/xelesi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9u9svripcd93edo7au3r3r9rv7/vaxokomijitesinewon.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa0ccead9---89404064610.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087480259c75---16982938017.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/db973aafc09748b37f5cbb4822c67e13/pesawedadujikapu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qv0m17ihbduoh1i0ocufnqscko/mubakijinimene.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090580a3f80d---15834912566.pdfIn PDF document text
    • https://energooptima.hu/upload/File/58297708475.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/6165324105.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/firexurijuna.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44129560461.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9062f42e---xowasidudosave.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c9fed431---guzogaforamirirafeberav.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731aa61af56---86255144954.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pakin.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403c5ea86---28996688085.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91899808695.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/fewukor.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/19vhsracl06q5fl3jk7fm35hc7/bujamatabizudukubevobed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=science+questions+with+answers+for+grade+5PDF 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_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 17284 bytes
SHA-256: f8902f2ea2a6da10a408131c2acf78e2eadfece52124b44e49aa1d0061a78518
font_02_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 11252 bytes
SHA-256: 025d3c247057112b22fe40125633b14d9ce1fb5534b7382d253e58b870f66c61