Malicious PDF — malware analysis report

Static analysis result for SHA-256 b147df0712db0255…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 02:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dbe515055c037d9b044cb5ea370a9a3 SHA-1: fe046ad5e38348ac97e11e158c5305590854aaba SHA-256: b147df0712db02559e7243df1b638aabe71f2f56d233cd8b32c2f4f9ca625ad6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gr-chem.com/upload/files/11121432739.pdf In PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/37164150073.pdfIn PDF document text
    • http://ternovykh.ru/content/file/64191631173.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bifimoga.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bogolemukelimop.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/67577309190.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/29905332399.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/38225873785.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/wimiledupukojemifukib.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210922193026.pdfIn PDF document text
    • http://youil.org/userData/board/file/39938817644.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/14833869960.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd27ed8aaf---5137206673.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6641efa1---zumof.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fomadonufiw.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/44109743118.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130abc037448---mapixukukebutagutabis.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/20119779196.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/36879932745.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/61600879717.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161419b2db65d7---69188576889.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f7407347---gajej.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/95889448743.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/47594844465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=terabox+apk+downloadPDF 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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10408 bytes
SHA-256: ed52333808a54a73e62d2a718e51a2e75170d98fdd0fe6bac127a451cc6a0d12
font_01_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 18008 bytes
SHA-256: 663e07d8e43f5f515afa2c9f7f9878d6f3a713e0b7b6f9be5a808b864f7f23a7
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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