Malicious PDF — malware analysis report

Static analysis result for SHA-256 f230bb611a2374b0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 08:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c75c4c4e66cf4667cb3e86ea8a4ef16 SHA-1: b5f6dcda0409fd72dbc519909727b79e0bdc84ee SHA-256: f230bb611a2374b072937c6bde8ebf9fa1e485ebbbb534f17cdb18ed0d1f06eb
172 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stilna-ya.com/_userfiles/file/37150747941.pdf In PDF document text
    • https://thefertilizergranulator.com/d/files/pojubobokimomewog.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb9d7d8e3---sagub.pdfIn PDF document text
    • http://landia-print.com/pdir/file/69139344313.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/patapiwikelavufagogewenof.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/99160199769.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/858de1e1bb51fa62a3fc3b8e979d2072/dadofazukolafipufofimo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/vujebuzonirewala.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rokuvafirise.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/2667755502.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/55838800342.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/12680810886.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tasitarojuwuvejunikuloli.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/perodovuzinup.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/98515296847.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76112886471.pdfIn PDF document text
    • http://vinmexindia.com/uploads/15146233622.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/baxoxuminotafigomadekezo.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/lugodenidosebosi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac4e425bb---bowoburixanejapax.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/64ce64062262e7b435fce30449609c77/91821989516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=phonerescue+for+android+freePDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10528 bytes
SHA-256: 491768fc12b9431c6e2bdd1bde8f48cd35972ff28d1866f7ea576bfbcfaa0791
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 17616 bytes
SHA-256: 769d4e1cabcacfcf988a74469f08bfebc16df33fd063fbb3ebd0c42404c25ed8

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