Malicious PDF — malware analysis report

Static analysis result for SHA-256 347d7fbce969f053…

MALICIOUS

PDF

84.1 KB Created: 2021-07-21 02:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: eed4cac836b087470df3457a462270f3 SHA-1: 1dbb74048ea955d95bfa9dbea724d54292ed542c SHA-256: 347d7fbce969f0530e8d2b286cc945746e40d16eb6d68b5bb1c1e09a1e8d07bf
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://technische-dokumentation-hoffmann.com/upload/files/xijejuregatujatuzadu.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/14106150711.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160916bdcc1ff7---wodobizikikejuzetukibo.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/81269274529.pdfIn PDF document text
    • https://netlandschool.cl/files/68288873579.pdfIn PDF document text
    • http://airsoft1.ro/files/file/62066711526.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/o6j9l8pt0j00i4rm2j2h0n0rp4/67301307029.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f74f95da080---pufetijorigusoror.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/2949138279.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/94876580859.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/12951403564.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/bajibal.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/247j9sjocnvjo4r4ctrht6ecb7/40979073451.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abff3bf0e4e---furebotodudijakasemimokew.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c657ce9c8e---76466227301.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/33951484409.pdfIn PDF document text
    • https://majubesar.info/contents//files/xumilelodukiz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fff77d53f---zapuvitagedivedorek.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/kujomivo.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/puwefivizomuza.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/57077025124.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/94079010530.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/mefubonujakiputoj.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ribaxuxedevijural.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bddea2dc4---6613615304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=clash+of+clans+apk+download+for+pcPDF link annotation
    • 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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10604 bytes
SHA-256: 84179a7592c951b4afaa417ee4cda4c028871b6a20b3d036b64ea4e6f36178d0
font_02_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 18008 bytes
SHA-256: 91b000da000960dbf65aa0ba007b089fe17d34a44838527692dbd6eeab0662be