Malicious PDF — malware analysis report

Static analysis result for SHA-256 44abb203417f505d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 01:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2d670b16f06c9d540a5deff6c143592 SHA-1: 83883f1d3ee7b80332f585f1bce411ec217fc1e4 SHA-256: 44abb203417f505dc640ec846e864ebfab6437b4c8869ee096d7f08f5059888b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs, some of which point to compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://delphin-restaurant.com/ckfinder/upload/files/10591002578.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o79gdgi3fqat243knsnpoveuin/8494393116.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087222841bd1---79896694534.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/13959724865.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/af325689fe1cd836b2c450b7d03ff069/zefoxiko.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/44563752688.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/2473816541.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744f15a791a---vifofakiwolofes.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/jmi25kiiac9l8k2aasafraufi2/kiselomafofeguponagepos.pdfIn PDF document text
    • http://poorclarescork.ie/images/61261352898.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c9bf94d16---88974746992.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/353b30a96044426162d435909c5b0a85/30587744652.pdfIn PDF document text
    • https://asi-filter.pl/files/file/4616977128.pdfIn PDF document text
    • https://protum.se/file/febila.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7d6ef18b---20513092370.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35f8c0d784---75248379479.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/53314961401.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/ruwipuzifike.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/29791807968.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/18822659183.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/41654108877.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/46ac6cefbffcc28072c0aee1e1befcfb/remurekojuvujurupukewano.pdfIn PDF document text
    • https://micsys.in/userfiles/file/romezakejuxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=calendario+laboral+2019+peru+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_off0000bcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 17656 bytes
SHA-256: 1b7bef28ce08670afa3fa5eabd9e205e7befb54435b31def5338d1c0aa34eca8
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10956 bytes
SHA-256: 3eb041b89a173855aed05457e31438dbc68d4ae7b8306b3b4c90342fa5574966
font_02_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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