Malicious PDF — malware analysis report

Static analysis result for SHA-256 f506032047007a85…

MALICIOUS

PDF

83.0 KB Created: 2021-08-17 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce863daa1b57e95c2f59c84ec3be21e4 SHA-1: 586c202aece657e0bab0cff8825c5c702b7a1b52 SHA-256: f506032047007a85d36970ff6d17324eb759189e94898b3998a0f8f5120a55e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to appear as legitimate file uploads, likely to trick users into downloading further malicious content or providing sensitive information.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111c45706---bojakavolupojotajonu.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7d07d54f053c9a2d6b39824adf78e575/65681837372.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607168335e6ca---xemobujep.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/49922608577.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/3063550968.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5a2124cda31cd8f12a2ac79c4389b911/megasozedofolamejodez.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc694c9f1a---kasuzibag.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gejolidilivenikimuw.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/xobakoxipisefovepidepi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0291e727---87153904353.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b311650e08---29020292878.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9ob4ni3eo0e4tg6l6ojvnknd74/37629725995.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2b32c1b3---juwixezuviwunaposoxuwiba.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/wagekafelijazegulidupe.pdfIn PDF document text
    • http://parentini.it/userfiles/files/vetex.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9cc227ff---majemunapixoxopezawo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/61110029273.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6a45d3504c3d09978a309d739e3fb535/zafirurorojizekog.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d3f85d1e733fda33cb4c64ef84827631/41458752832.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17233116461.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kubedoxo.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/36636381670.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xosodifojixemiseraf.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aeda0577800148d8d1cd5edf24d7857d/fakuzajafoziduduvomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+nail+kit+on+amazonPDF 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_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10376 bytes
SHA-256: c71ea6679dc4cc9e0b9b0bae6bf0c940afbe8f78f3e744c26fcf18171a1359b8
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 16980 bytes
SHA-256: f5f68ea2149bb1ecb2442e1814b473adb34dd8e85fca5a93a48f4458a9a46454
font_02_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1