Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff17ab30e3399302…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 01:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 382e105e8c7c7953605b3f82307cfd19 SHA-1: 65770d0bf27539d0f4a8af49fd86662cdd07d14a SHA-256: ff17ab30e3399302a7a68291c5d69aef8c84a8b83db1938bd8e4668cf82c8128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://remont-etalon.ru/upload/files/xosuwowawox.pdf In PDF document text
    • http://mosme.org/uploadfile/files/18144337623.pdfIn PDF document text
    • http://shopabrang.com/images/files/71956008833.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/gigifogawefetaf.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/28345915574.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/88689060355.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fc00e367e7f24a6e9f0df1e59d26c010/84209855560.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/60115926352.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/69717591415.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/jorazakisapas.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/60195740743.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/80686069877.pdfIn PDF document text
    • http://freewest.at/disivepirulakevefox.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/mesaja.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130121bed67f---mazimotofiku.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/70300471991.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/vudot.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/41ff0313be01d78035c30cb04c87cb6f/moselufaduwig.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/wenuwewejufida.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o0am811l7uc63g42ph7uotna95/xenupozopi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090704541573499.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/kufuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stop+surviving+start+fighting+pdfPDF 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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 18472 bytes
SHA-256: 37e8d53e9e7eec8a401f9ddbb78a553620f28904eef6cdbe49574b197ef4b3f0
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 10840 bytes
SHA-256: dfa85b11d8ed21707317e40494d1e9c3345225b91d8f7dcfc028604a1eaf72c6