Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8f1e98bc41b0f9…

MALICIOUS

PDF

84.4 KB Created: 2021-06-30 11:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95cc451748c8967bc3917194362da0e4 SHA-1: b8229f7728d76057df5b635385136d8fe949ce90 SHA-256: ed8f1e98bc41b0f92f0542e32233be6dfad87787d51788773a5ca7161c35f351
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=adele+we+almost+had+it+all PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/o681afhi3cukdssdgc7e2npngh/4284457933.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/284b17cc69b044e944585780cf037c0f/biparojojadinuzaxaziz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/namezebowenuto.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/67270975606.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/70323928867.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705d116f622---74322151750.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062805110887.pdfIn PDF document text
    • http://biomisszio.hu/tmp/nokopuki.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pozubanupow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf68ef1050---59535431831.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/wironilumokos.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbc8b2848a---bedunawumar.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f61e5658---71757801052.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mqlt196hpiirrrfqd80etpaqs6/8083223121.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nudibexunukajudedu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fbb5dbe0e8acfcde75e0023933b4b544/jukovotawapakatupifaw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f6da0b3d4---20467488802.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/81146532731.pdfIn PDF document text
    • https://etadelloro.it/images/file/21860058524.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/pomigitekezi.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/h53mqn7sqjt814b6oslseetc61/31246065345.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fb7bd124c9177247b9904361e6f711c2/muvugomiraxafa.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe1ac64e6---kirapopakovugepew.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/39082154189.pdfIn PDF document text
    • http://altinay-law.com/images/file/19432403538.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 22164 bytes
SHA-256: c69746e6d63927ff556e93004a1f65e1881c5066d21fbbd04b01c786196de528
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 10376 bytes
SHA-256: c019bc2d6c5c09c35e6e71fc7213903f851f161cd621a5ed86262daf72d58dbc