Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d555f7afbc0a285…

MALICIOUS

PDF

75.1 KB Created: 2021-07-30 01:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f174427cb68ac1a5122685837985e5b SHA-1: 07c34d8a7894905c55fc7904cbd7828d39f568e6 SHA-256: 8d555f7afbc0a2859e1cab06236316faa713f80ae0db8c6e5c87bd8225e7770f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm, suggesting it's designed to redirect users to malicious sites. The presence of JavaScript points to T1059.007, and the nature of the PDF suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://polipadel.com/userfiles/file/92614303398.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/84965547111.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zazemavu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abbc141cd64---pajudupupewesosineve.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608271c5ae108---lusaburavibitepakewesaxo.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/subowizetaxanojetezim.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210717060533.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/modepedad.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/75887367721.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/55990669784.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/27inh9v61j2dltku23prp7p78e/jesalosil.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/xemigozu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54168846f3f09add6c74c34f58603323/98305702998.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sowenirujexovenomon.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/sexamikogekipewasomowoki.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba6768b8d---16796011834.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/wadapamow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe31ba335c---46596758738.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/6544531138.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70745810288.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/jevinalabexi.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zobigoretev.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/r6nfpr15trfnoo2v10nqdlepj5/wevapajumej.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/giwovumizewenul.pdfIn PDF document text
    • http://nova-auto.com/upload/ranulepolebunari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+clean+bissell+proheat+premier+2xPDF 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_off0000bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 17540 bytes
SHA-256: 810105da838a65703d2954eaa43eabd3fc33d62851be8e6d2333584cc857ed69
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 11080 bytes
SHA-256: ee21688f4591b85b1773bad53236dcf5fe5d787734ab4faa4504b49660eedc9f
font_02_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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