Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f376b4f00b9acc8…

MALICIOUS

PDF

90.4 KB Created: 2021-08-20 00:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b675fbba36e65c6fabc284e8a18d403b SHA-1: 63e2a912cff7b1bf30d84f158f0abb1ff531683b SHA-256: 7f376b4f00b9acc87f72f4d1b67bfafd2a08bd44df7f8a8ca5f827b56c501bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://ondrejkocar.cz/img/file/xafosurogamesokurob.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d9815e2d3a20686cb58f2859eb91f509/gepagazapodave.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106101629582090.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/18627451094.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e1ca982ddcdd291000949dbf84d05b48/rulukaxepodotatogivitewi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b826fc3c8bf---1065084886.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d793446e5---96329279856.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/leviwasigopetodibifut.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/a3ts93ntr0712tgtt5108aam35/10538749105.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/77d4168ab933988a380719c253bdcfee/zevovom.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/jipirugojafuvoxugixab.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tukinuwasitugufukakokobe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/31cbd36e27f342f7e26cd0c0c6cfeabb/mezowabulavesoj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7daf8d130---56750531213.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/43146775391.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0227b7e7---55772392247.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c81ad23c0---jilimuvitukexif.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e97c02b34---xanotuwu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a3bd985e587a14d61bb0a21331640954/66115461695.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/92487560133.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/lasikizifamilow.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105250606364569.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/17629173159.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54de95b52---guzadanavud.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/vojipizokegigebuki.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/uve329ggso3k7n5kc600c3reb6/paxaka.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/wijavagerigovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=libro+trabajando+con+la+ley+raymond+holliwellPDF 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_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 10892 bytes
SHA-256: 5a1ac906c47462d31d62be984a2b335b508f2b015d13b1330283ffcfabe464fd
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 18572 bytes
SHA-256: 4ee0a5bb11c44bfd9c39856e357af94442402bf0696df875cc11f8676c7da4f2

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