Malicious PDF — malware analysis report

Static analysis result for SHA-256 874518627b16c88f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 16:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f542ae54c10ad53a27224a384e028452 SHA-1: 848e7f45a7bd482169eb43e364e31a233d9dc248 SHA-256: 874518627b16c88fe287684f5f4a7a35a0ef8fd8632adab7a7dd5b725f34beb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicative of a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' suggests a pretext of an invoice or payment request to entice users to click the malicious links. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b429667fc---99351916528.pdf In PDF document text
    • http://www.manorbymajor.com/userfiles/files/99156080476.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/gifazaku.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/beboxobobam.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/sadufiwaw.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/15693121094.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n3b16jv1lnfp0mo0qr52nd8apn/fazodorodapitil.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/kusozenibolefedimarupeg.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lazojasazitiwakun.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/zoruwegaratefafajelopiwow.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/r94qk7hsll9kere9l2macedgc8/domexozez.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/14537679806.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u5ajmd3849n56tjv03gjhd4j86/wikimo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607234b9d5aa3---meduxatiwemipokejimavo.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mijebisuzosavexusib.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf09bc94d---18339794870.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/liguwesukew.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/3972503358.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762944285f6---38031285861.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c750f059e7eafdb7712cc1c3a2df0fef/lurirulodenibipegad.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/410081457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=accounts+payable+workflow+automationPDF 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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 17096 bytes
SHA-256: da0a7a45779bc953208d17dac2466afa2d9a269364df4649d601fd19cff017ad
font_01_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 11152 bytes
SHA-256: 907ed1c38a1bee0fe33878543a832b81a5979818f4c968ce8a896f7e2b078120

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