Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd0351c4f74b3f…

MALICIOUS

PDF

119.7 KB Created: 2021-07-20 15:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2e800bb6ecbd07a62de20bf5488b01a SHA-1: dfaebe03c26eb630dfaa21d0edae2572c9262bf9 SHA-256: 73cd0351c4f74b3f9acc8b1e315042a4d7cda0e6d84648968cdfb3a7b7d28547
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5d6d2f88ae1b8d2b513c798a5603f04d/liremo.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/688535c81d8371ecd8ebe5c7fb300e78/pabirejegawagitis.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/94b4cbcd87fd424b8e055ca1295b1b31/41332430871.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sabc0m64bbkm4g4kfvgpfn12r5/sokomi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083687be3555---gixutifu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/090095ac26737c06ff334f22a27f203b/15900510316.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d9632600d0e14258ffc23856cdbe40c8/tusixasaxakozuwinafara.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b792b0c644---lefekogumawunarexadu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/305a55a06dd844450743270c5ce733a4/7323432972.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082af77ba927---kinovawirizapemepulaz.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/jamivajoga.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/094636cce742d88391847763a886ab8f/83601077657.pdfIn PDF document text
    • https://tl-systems.hu/files/files/92948928601.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sgtr5qol4qn01klgosg8ihbrmp/17345901094.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c75d12183---3577165975.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c10b6f999fa---bosamuke.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/73740442870.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m42imtq27kbmitnbp7avo5sm7l/kugifemo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0a0966a58c2165d74ecff1c903bdb893/javejosixedisenolofexaju.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ed04hh9jmfk3835dk5ljgmcit/31151983328.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/53260313705.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/metifiromexutoboxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=utilitarianism+a+very+short+introduction+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16603 18340 bytes
SHA-256: 9c6d300df6802227c1e92c318a392c481573081992d1ff38eea740fd9620de18
font_01_sfnt_off00019446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19446 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off00019c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C5E 11172 bytes
SHA-256: da7cf1ccb66bc2f4a219bc7a097e6e69fc7f4320e6e485cad4e2c3ae6f635a13
font_03_sfnt_off0001b655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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