Malicious PDF — malware analysis report

Static analysis result for SHA-256 921112eab79d2cb2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 12:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0d9241c120f93339ef8d0f7a7ba074f SHA-1: d22c5e2eeada5c773ae125f85e3ffdb44be1c87a SHA-256: 921112eab79d2cb28f14af189fdbe04f54d495bc3a15bb69e88fbbe02ba94e3c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7d76720446cd3bf4126adb6084a547eb/63515996590.pdf In PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/83276369259.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/dukafu.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6047240509.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/doxamomizujefi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bfc7b4cfa---9104837825.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cf474fde356---16236767907.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/521d65aac4cb14ad41f386b72ecdfbcd/98527503984.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/tafanogekovulivewezulovu.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/vaxatilateguxebe.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607042f3c9b2f---51916535148.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xujofaxibidonewaxoxateg.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210728131039_79w5n7.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/57724128998.pdfIn PDF document text
    • http://haai.org/upload/file/zakazametefaraj.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/99617661168.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/ropalodokubikexesoxo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/menateperegukiv.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082697e82d6f---juvatesatoto.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/34bf66fa5c732c6118d44a6dfd1ca76f/nogatowubozubafo.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216141419433453.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085946cbbbb8---wemusefopezer.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe10769f2---ropeduvefofe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7796100225c156a5816594a76a16604a/zilokirax.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/43527583716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=easy+boogie+woogie+piano+sheet+pdfPDF 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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 17140 bytes
SHA-256: cd933eff9094ff2900ddc50f5adc951e75ff5a29421c2245ec1af8837811a5fe
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 10956 bytes
SHA-256: ca029d6057717e3fe3f745d1c42af9758f193d7a6923dbed75782656c4c3dd27