Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69251c4ceda5f98…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 03:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c175a28f8fc3352c36fd4e9438368f85 SHA-1: 7c5170b4603d4d8802090beac1b523ac209d4ee3 SHA-256: a69251c4ceda5f9884b408bf5e903210db4bd0a6ec2e46d0df5db0aa5dc3729d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cmorshomecareassociates.org/uploaded_files/userfiles/files/ruvapaga.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a9c61f4---72064038853.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/50272505063.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/4779419585.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/003237f41ee9485f6d2cb3a88d893b24/muvapot.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lakoxefifedonowaniwo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/55197132638.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/zaneratuwaso.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109052034246409.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa3919ec08---nujuzirirakevizutedus.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/feterixivukixegon.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/88548151652.pdfIn PDF document text
    • https://inks.bg/userfiles/file/9208193310.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1c44f3d6f2b81fc300013c2baf6d9733/11929332977.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/22480711921.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/sefejoxe.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gekojadenufalopitetiviwe.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/27123024211.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb1159689---59225651302.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/gixujinedejorip.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52376626058.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/viduxaxaxi.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/39342171127.pdfIn PDF document text
    • https://synersys.fr/contenu/file/fosewatukuzela.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gizovabifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cruella+movie+subtitlesPDF 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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16952 bytes
SHA-256: c1fe47deab5adde3ec4d8ad057452cb61b0980457e83645d300b0ab250a5eb64
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 10500 bytes
SHA-256: 6d536d9ea807391ff1bdf5dafe22b32c1e6f807f0fdc4a8de51ac4913f59ca08