Malicious PDF — malware analysis report

Static analysis result for SHA-256 983a4f49b0b4a7da…

MALICIOUS

PDF

81.1 KB Created: 2021-08-10 20:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 225653a028e1cf2b6f7c5d6a666d7f8b SHA-1: b07e7f19e07dc46ffdb0a963769cb4b7ded541ed SHA-256: 983a4f49b0b4a7daa658d00078a6a019a028cf6dd6cc2eadc7eca847aa50f9c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links and the overall detection indicate the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=rolling+sky+monster+city+download PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b748dd1f---23543224991.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea1e937058---vobepeforixitabo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ae5b9c99b3db6b61fd38251c6f97a14e/35812737075.pdfIn PDF document text
    • http://planbmedia.hu/files/pudibizifimagelotuza.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607080c6aa8f6---bewubumikabul.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f38307078---bebovotukuvi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/74628168487.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a938fdaa---51110582658.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/veniwolodobixiwix.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7fa71f9c7---40537813456.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xogibegelukaseve.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lajub.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa799e734---munulirosazodasupop.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/609179dcc89adcc2c828b87ace0f10bb/tapuwebapibogikifatopizo.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/52837087103.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/lefimubefuvapax.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/89306199325.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/tuxifatajekir.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/19561816731.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kujupuvikoledatutizoja.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160804bae19fdd---xivubagodexalolitididud.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/wopirerorujexesixuse.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/46785637261.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/fomiwav.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/67981474771.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17400 bytes
SHA-256: 42ba573fa3f0bf6aec238d820e7bd83866ecbc0c92331308318cbd551f558e93
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 11048 bytes
SHA-256: 273e86aa0834a1f14a616b19334557ba7038a8cfa53fec422ff8b795c908393f

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