Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9df11e95f678794…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 00:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8786801d30c8ca8e1191b89b0adfd0b1 SHA-1: 42e24daba4e7a851222392de0a89799f6db218d9 SHA-256: f9df11e95f678794d8e4ec7b1addd5c81154378ef16860402ce64545c4de0be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086372e07ff9---63268391269.pdf In PDF document text
    • https://bocrangsuthammy.vn/upload/files/menasujog.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871cef0522a---51246394427.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jizab.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58335046628.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210723_ACE3E3997D3FEC65.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/11910624666.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef86c407f---fezamenedilunenepu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/fixel.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/89391118033.pdfIn PDF document text
    • http://rooptex.com/uploads/xasomimaletepuk.pdfIn PDF document text
    • http://jucal.es/images/file/luwar.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2000f0884---18021846484.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/13567341706.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/28842381362.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kevawawokufadapo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdaa60182---80114565163.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/wagilemomiguw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c736b114d---24102134164.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109021719298449.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/78343309360.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/nineku.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/zawufujatajoxux.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mitoxakesagelubedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+matematicas+sexto+grado+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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 18348 bytes
SHA-256: 38c6b786ab2884c7e9646fee5e847a43027c888c5380b589262d2405437c5ecf
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330B 11028 bytes
SHA-256: 08b05e31316e4910a5a9a6c222f6f6e4f8263b3e5b30ad28344af6c7f5942782

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