Malicious PDF — malware analysis report

Static analysis result for SHA-256 4846f0282f8986de…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 09:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20a1311208729013123a72de91ddcbdb SHA-1: 35942527f7e30d3d3466c3d1907ded165f274969 SHA-256: 4846f0282f8986deb3b9bb474de7eb7c1596a56879c9fb0e9096ff209e9f71a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous embedded URLs that point to external websites. Several of these URLs lead to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://allytemp.ru/uplcv?utm_term=free+gba+emulator+android PDF link annotation
    • https://tjpapigroup3.com/contents/files/69901096068.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/golonoken.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/rinodamusedamiv.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021932014355364.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67423511117.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35603748654.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/rusodutezuliba.pdfIn PDF document text
    • https://almavilag.hu/files/files/51515321776.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ada60ut0s246aqnvcrr5efojil/kuguja.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/koroduwejikozes.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/6462745927.pdfIn PDF document text
    • https://coevent.ru/upload/files/37967415907.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/79010681532.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/ketulalodimezarawarivuk.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/kerogiki.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5a2840a6---36365078274.pdfIn PDF document text
    • http://www.centralperdana.com/file/kukosire.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26518980914.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/vadiwiworevavelivoj.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xalugag.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613567e9211d7---69637609586.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 10640 bytes
SHA-256: 08c0f94729ac514a480d6de7d04e5d6944d6e3809d95e56874e8e02ff983be5c
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17828 bytes
SHA-256: 2efb21380950e8c0393f5ea9104a8cd89159c52e27f7008aa30be695b737ad05
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1