Malicious PDF — malware analysis report

Static analysis result for SHA-256 900673bc7adf1003…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4451ae9ce25a42d9718ff270ba64cf16 SHA-1: 01cbe40752c8295edf8ca295ec0075d61dcba3ec SHA-256: 900673bc7adf100371547f3d18537d5206f9a398af85e734e44defc9cd939dcf
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, leveraging multiple compromised websites to host PDF files that redirect users to other malicious URLs. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=american+express+travel+booking+phone+number PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086206ae9a41---rijifepipisegegajumorobuw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf2be9ec7---xabubovobofinurom.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3fkupj9vqnftoiakjase15j55u/sotabaxisor.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/70003128869.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/65553304231.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/butowisedazuz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d26d8988c---59305289815.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2f938cb4198eb0f4df66758b3c932c65/38553748696.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/70296372597.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vedunipuvakatatitupif.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/545035c9682226f54d7ab6ab48986929/tixiwov.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce08dbf15b021ecabda0e97deb0d7d70/84986847139.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/60140268272.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/6348541402.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a14d1380---megipunere.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744199f1dc5---rodubu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef617aa22d---10930045065.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f777394927d---69003488496.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vutonoli.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/fimoda.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/20841046104.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b1ea189d---zolaj.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/lugoliniva.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210521/2105211220075483611lrtkvxikp8c.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466ce546d0---51448064979.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 11304 bytes
SHA-256: b09839bc40984ef86ae2480b0f09d106165de7fc941b64e58cc26bd280feb0c6
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 17224 bytes
SHA-256: 64b3cc58c350fbb1e35188df3ad3f4bdfeeb1ecb73e1384b70ef3635e9343080

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