Malicious PDF — malware analysis report

Static analysis result for SHA-256 898f1d89952d2edf…

MALICIOUS

PDF

88.0 KB Created: 2021-10-10 19:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf292798e5f25a9be37060d9a038267b SHA-1: 34b7bc70bb292b27519a08b73191ee8cca1ee3b0 SHA-256: 898f1d89952d2edf30755bc7bb205cb4c898f9729687fc87bc3b2107b877adc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=divine+right+theory+definition PDF link annotation
    • https://toscanafantastica.com/userfiles/file/moxapam.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/turinamatixokatiz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143971bcc679---kokonusotilisutonejupi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134885a4fa5f---44597916079.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/fotezul.pdfPDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b2bbaa4c32fe6eef18048a98bc5cde8/sojobizadugipamusifupilaz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd5dae460---9674850468.pdfIn PDF document text
    • http://tercovci.cz/files/file/zifis.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zanus.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rufojixaladixenoke.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615c270469ed4---gevapovaxowozesemurotivur.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/95537115321.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/45619630106.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210903200154.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/60936415394.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/gubagulevu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/3137043845.pdfIn PDF document text
    • http://yjccnc.com/upload/files/lilininugomazeripaberose.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/60753299232.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/f7upn3grs35h710ql1123nruk4/pufirubesejiroguviduzu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff1d9468389bcacadd0746d633351da/xerulijemuj.pdfIn PDF document text
    • https://hssanesteban.cl/files/ritifakeziva.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d887a193e8---96127877772.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/wowavesevetutosivur.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/vetojakitavuwetezubitifuz.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/92535865506.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/pizegigifalokazi.pdfIn PDF document text
    • 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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 19580 bytes
SHA-256: 921edd9d0f941d3b83be51f9b85413e6c1260b12f876c07207460985667c2cf9
font_01_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 10436 bytes
SHA-256: 42163f6c381da1d7cf58b435b09ddc8f75a224471f8ed0b85af44d8a8fe29167