Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aaca24100e9884…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 10:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f337bd4a790a757abee26c0438e1215 SHA-1: aeaf57a7e5f336b777eea8f9b71ba37092a5d525 SHA-256: 56aaca24100e98844a136d5a8e04d3fcedfd9ead0e1a8f8aa63f0e2df35b84f2
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a pattern of directing users to potentially malicious or manipulated content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://asbufestival.com/uploads/FCK_files/file/fidalulabozopu.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/derofovixilofifuxerum.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b1f14d095d173930f02b133f016b71f8/29755658618.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d2889f62159f603701b31c1401aeabca/pupotafadoteweserevomamex.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d4ok320lqnv3mjdvipds5rcu1s/61884440617.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rapatijetu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d657970fa8dc404c9d649f8cc2b4484/nuxokexaluza.pdfIn PDF document text
    • https://brakos.it/file/dulavazag.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lovklcm74ud0ud02h1krl1o4c0/36429455859.pdfIn PDF document text
    • https://birudongker.com/contents//files/sepobabawumim.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfd030003---nevukatusakufopiwewut.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/80329242753.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/40354944470.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5322dce2---64759705565.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4f16b04201dac747fff57d765fbf342/fixusasufeva.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d1c1dd6f3ab339990e831503ff8b7f3/rusikidazudare.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kkr4l6gthemq94m37fbdllm1h0/wiwafili.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/95349060786.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2ed49933356880a6d6f423dd5b1e5699/revewanuxa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//82426084612.pdfIn PDF document text
    • http://df-2.de/images/daten/file/5488413983.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/39924404636.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c183d804e---52447913460.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6e0340f9993fafae52d2bb6488f70e2a/bopifiguxatuweputi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078956d162d7---rimenomizu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078354382d53---56222927210.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2868bf44225467f8e5146b6ef55dae99/tijuxanofutuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=taming+the+wild+side+dog+trainingPDF 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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16556 bytes
SHA-256: 0d0dfe9b417d1736ad26040ef15417686949adf1ed4cdc060665f7effb5b2246
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 10744 bytes
SHA-256: 11e3c14ad28ed20d4cdfb2cb6b0a7d62616a000298be195442c8e765e0a400f5

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