Malicious PDF — malware analysis report

Static analysis result for SHA-256 745978c2f5c61c2a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 16:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e210ae85f8732825af3c1b6fca48cb6 SHA-1: 256dffbe9d15911134429f5e8e6fcba4681cdcd2 SHA-256: 745978c2f5c61c2aebf0aa3eba25fc61f59e9228d72a08c23553a7305977206a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pasationtravellers.com/root/FCKeditor/file/38548297992.pdf In PDF document text
    • http://serramentisiciliano.it/userfiles/files/72734479410.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/gowajilojozekilixifa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161348b9ec7b7a---nosenured.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fca27a169---76986196742.pdfIn PDF document text
    • http://parilka.by/var/upload/file/josakanogodaxonatudafaj.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/fomofewukatanenom.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/tinokonakifajusaso.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/7985871593.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614461c707f58---82165241918.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/1211961647.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boxaxok.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/30520659085.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xezubagagizawatofimutate.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mitefexozetotaxiku.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/84775329529.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/paboruzavixewulefun.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/54504686238.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090808034334.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/dibupenosonarewasijuduga.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vokibejesixakunopej.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nepofoxovarezijudedexexo.pdfIn PDF document text
    • http://tercovci.cz/files/file/5896825289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+good+fight+season+4+watch+online+freePDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18056 bytes
SHA-256: 0dfc5e6eaf7d6b3396cf120cfa4d4220f4b1e809181139c8a2a783e34d5a0a8b
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10880 bytes
SHA-256: d03a6fe4e13b75d8c3c698b1e37798ffb2386e23b5a0148237e312192d68b562