Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdf627cbf2fc26b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 21:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 575860e9c5a199f8a8e314bf1db6b049 SHA-1: e955e647c27ba4ff523ac195e6ce35d8969ee398 SHA-256: 1fdf627cbf2fc26be20c37b812dbbf4203d0ed76ae2d8440a8b9b18946ae9b71
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity is driven by the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://samarthanamparisara.org/apadmin/uploads/userfiles/files/xapudaxukiremonudu.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27127fbfd---23145517721.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4550099500.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/romebebesesiratejunotov.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d534d82b62---24010175072.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gffjkjtqjnis92ind643bgebjc/lajani.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/97781286943.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/pirekaderefakejape.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b019932df31---wetiwoxixujozisafe.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/wujigozilafevoloweza.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/pasaza.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1a4adb87---78867053686.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679cc18a82---gomilirotapivudojodedujo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f4679d0a0e571729ed3442952027a318/genanafivuvi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ef0ae573ac28cbedd91d862399f50b81/debezofovuwewuxek.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3e84adebd9bd64f7f571860ac18f65ce/jawawapejiligorobali.pdfIn PDF document text
    • http://beiks.info/public/file/sifikipumuv.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9761d1673d0f3a023f1ceb4c4f6c40f4/rawitebebipov.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/13a515d41fcd83b5aabc85574cb142d9/duxasevotuwagadetize.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/xuxotaje.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee521f49c---dubufegebugukat.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca5b0710b---rilepapagukanabikaguxuj.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e4229426e4c88eab5bdc4e716e0f8663/vokujejobitideserijumusa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/celfh36lfr276ceoegc0nm9tc5/zadiboxuwunasuw.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/88786916340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=driving+job+interview+questions+and+answersPDF 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_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16604 bytes
SHA-256: abc071bf26d8290ed7a0f8933fa5c49b6dd8e132882492c7ac964b3c860fe093
font_02_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 11044 bytes
SHA-256: 3be79cafef2c6996c6e7c82eacad89ba75596375e580513b1d929379a994bb5e

Open this report in the interactive analyzer, or submit your own file for analysis.