Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ae2684a5f54092…

MALICIOUS

PDF

129.5 KB Created: 2021-08-13 18:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82b352b9530290f616f777e91b666d38 SHA-1: 9f840f0cb32ae0d3b293e7023a84f6d9cfdf86d4 SHA-256: 43ae2684a5f5409273ee614489aa146ca31fbdef9f7a36bf543733b0493eece5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=how+to+set+the+temperature+on+a+masterbuilt+smoker PDF link annotation
    • http://edv-denk.com/userfiles/file/98584865208.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/petuxopubusanome.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/nikekiwonu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/xogokidinijepofu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/64901403018.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50c358389---gibafonoduxalukes.pdfIn PDF document text
    • http://freetds.net/userfiles/file/jodevabatetabu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ee574758c9bb4fbf3ab12d78126dfa67/fopipe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/h3vk2tsr5gpiv1bhv6uijb6b3i/tuwelimebazabobedujag.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162841097177.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xedoge.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c5aa8f2001db76ba76dcfecbfe952c3/viralisiteranurefosuk.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549e7bd237---rinufotudaxixejevisemul.pdfIn PDF document text
    • http://partnercable.hu/files/3601421103.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df7716473---puduxowakot.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/filiboz.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/bugagutokuniwexagixav.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uh2neoqv59g5ka259m7a33jiv/53598209722.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/gutofugomafiw.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/28560550243.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/wawurirubegolajimuzoni.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/vatexokumudatakodid.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/15977945910.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_off00019394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19394 10924 bytes
SHA-256: fbc914e1566c18666e93e0c31fe89da0a86aa84b64ff4de41b8924cfc7f9cb4d
font_01_sfnt_off0001ac75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C487 18264 bytes
SHA-256: 2bd8afd63112127ae64b17054beacf1d8b19e66f59854dac447d731a4ea8da81