Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34105d4f2459113…

MALICIOUS

PDF

90.8 KB Created: 2021-07-24 06:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 288f2b80d7faadbdd74bc3dd801889ab SHA-1: db7458af688d85ccf1b8c894694b81a2b3dfc5fc SHA-256: f34105d4f2459113975e6ec2b4e92ba088018633736e30a2c88009c7269a8955
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and a high number of PDF links suggests a coordinated phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917d44497c1---mojirametonobatavuwineb.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/l3munjl17lnj23o3hmo4f0a7n5/kezifiku.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608062bddad85---zivumivosunuta.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/87027389834.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a495a8326---82896672950.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2efacccda746a1203d1ac1e786cd6818/nuzimigudazurenerilobu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fcfb15d9---puvupifubazoxufubo.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/44287957533.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608099c968ded---69364718506.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3a5a04b8---46061181947.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/vewivuremukokobako.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa2fef7---likisulalejazeketam.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160fa58d91b105---9028266936.pdfIn PDF document text
    • http://teknis.it/userfiles/files/91017431457.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e8a5ba92694c07245126e062f5420076/roridemapamavipufumip.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/m7a6f0t6cu9ncabuno46rjt8pt/15560998122.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/86149514140.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753bbf26db6---86095924587.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/69219398599.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/tupepirubegevekewaxim.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/rubanasenatixu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/safisogopujetedazutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+bind+traxxasPDF 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_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 10384 bytes
SHA-256: ac03dfa15015db85eeabf73eb7916c2bd6f8f974f585757eeb29e98d4399ed9d
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 17048 bytes
SHA-256: d1352e21b183a9632617ca273248927e9d8f9b3204ed45c6936c0a40128135e6
font_02_sfnt_off00014588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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