Malicious PDF — malware analysis report

Static analysis result for SHA-256 4497997935812a44…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 13:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc21de8379f349bcf294eda547451b0d SHA-1: 8c599a4fcfd829bd8f2e5e881c3dbc400b111f38 SHA-256: 4497997935812a443d35a71310f8567adc4a0aa4f64138fd0d2779efcd9706ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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://etalentlink.com/uploadfile/file///2021082523140764.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bccc4853---7974177909.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/77570948514.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/28949155908.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/90066393830.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/94cd1ee9c57fa692bc78c1af0513a1ca/1404817258.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/mukujebovazekaxabim.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/2479619600.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/natonaviromegoko.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3324efe3a---vikumesate.pdfIn PDF document text
    • https://inncredel.com/uploads/topoduvawubivajik.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/xifapawudowejikow.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feffb9231e9---xajajexajupebavuwizunijez.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/legukunigazojeruw.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/jaziwawodexepewebova.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/51045617551.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/93512467660.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vopufiwijaxop.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81053906693.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/runigobojifimozukar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5b980d4c0---mutesisod.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/57521889074.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/71180729188.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xumefu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ap2v659ml95s7mti85c1ehtcdj/fisokixusilekogad.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/7915427455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=death+valley+np+map+pdfPDF 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_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 18300 bytes
SHA-256: 4e914030c3d8dad7e1c5247f353277c8859e4f610b080dd957fe28d1b6db7244
font_02_sfnt_off000152c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C7 10464 bytes
SHA-256: a6add83bdf4e0c7b0b070f780f47c6901bbaccdc9b97206f3c128a47cf9cd6f3