Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3058bc84273af33…

MALICIOUS

PDF

80.7 KB Created: 2021-10-11 17:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7c5addd4c6f1259103a43146638a15df SHA-1: 0940d0074430985718d45f40af13c9c99264f654 SHA-256: a3058bc84273af33d5240bfc4fe3bc959960b129ba38b47ccdd17e58da7433c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=the+10x+rule+pdf+free+download PDF link annotation
    • http://gmei.lt/ckfinder/userfiles/files/26367034482.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/fanozoviwinijadabizuvax.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/92981896853.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/lijifot.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210921_160607.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/bonabevaduvuzu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/64670210047.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/gowuwofivefetisu.pdfIn PDF document text
    • http://climtech.com/files/files/11588995719.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vorijuw.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/20230542262.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/11b7a66288e0e9cc78b6ebf4e90f5ab3/merosoz.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/39527778056.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/67047294820.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/34800852122.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88c049cf5---xinarofifome.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/87362933899.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/26714273225.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/29324327465.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lusiwo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f608076c---89415135050.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/tugixavutezawetovavokixa.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137115b35ba6---xulatotom.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/robewabi.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/30156165911.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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 19008 bytes
SHA-256: 5ea1f387731a8f9e786f14756e1dabe97faaa0bdfb9820d319ddf1ad55962e81
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 10664 bytes
SHA-256: 7807e1fef52fdaa1aad79a74a3905a37596bee063b35adf71caca5a9514719ec