Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb54a07e4f772da…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 12:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce5c3b6398b5561bdb406118bd9afc8c SHA-1: 62e7c0f23ad78a95cc479ab8ec536c4280d3ae88 SHA-256: abb54a07e4f772daf61060a6f96edc37df9977ef4afb90bc1d76e576bd0f4146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, several of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=how+to+set+up+usb+tethering PDF link annotation
    • https://monyetmesum.com/contents/files/94290996116.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/76491987428.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37533988981.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/fifiku.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/24472670038.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/jamidodubija.pdfIn PDF document text
    • http://maihome.hu/admin1/file/komupusazajis.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/18451225485.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e963251833---sosimavel.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72228599724.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/179be8602ee054677d2937995fde4be5.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/93835834666.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/92160370652.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wiveguwud.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nadirofimu.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/vuzagigifofuzapo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/2293578871.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vuxabizatekizob.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasezigoniwalosugeve.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/82383479662.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/77907422382.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ee18f7e5---xovebuvozowu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d2a1d667b---78322788959.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 19168 bytes
SHA-256: 8ad74f8e791678dbb74e91c39f42b86fcd2eed4284e82468ecf30e9ecdc19e10
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 10640 bytes
SHA-256: a25c6e92260922375a749ac4b41a414861ccc420486db57d70658e8f1b28c557

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