Malicious PDF — malware analysis report

Static analysis result for SHA-256 deaef8cdc0b8c613…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 00:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75f2e069cc975566461ec04503ea3983 SHA-1: ead825ef497f2d7f8638fa87fa7a5acf1c303abd SHA-256: deaef8cdc0b8c613a71a219f0ea99b28a9cac7a6e4f5cfec6d133725a4f56415
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The document body is heavily obfuscated, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://indianspringhomes.net/userfiles/files/pirebino.pdf In PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/23943929509.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614086801b0af---wuketipimupuwugutov.pdfIn PDF document text
    • https://everestart.com/images/stories/file/48085342906.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd7ce91f5e---47404376488.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qt90tnnf2qc0o78nkbf0lntr6q/wekuxilexinozofogoni.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/dikekajasugebujo.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/27490709725.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/35142459956.pdfIn PDF document text
    • https://inks.bg/userfiles/file/12797976446.pdfIn PDF document text
    • http://raczcsalad.hu/files/munore.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sisorufod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354166baa---8158499198.pdfIn PDF document text
    • http://fxlcd.com/upload/file/6898299300.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/7696981391.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/77201229119.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zejoduzataxetawi.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/65176565168.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/lenosegib.pdfIn PDF document text
    • http://asvpp.fr/pdf/bivapisodavu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147b11143b89---53855807.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/95692832546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=framework+windows+7PDF 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_off0000ade7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FE 10468 bytes
SHA-256: 11c467fdba9570eba98c3677bbb1b7f39e7a1972e984ecad1bc62deda8a117c5
font_02_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 14880 bytes
SHA-256: 8dff8e3b70dfd94c17d67a90b154c6263253cf65fef4f7cd3b25fbe34ff58d6a