Malicious PDF — malware analysis report

Static analysis result for SHA-256 beff23af2cb6f992…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 14:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 673cc64b5e67dc6acde4d7523e02253f SHA-1: 573b31231851c16f812911167bfa39a755f73158 SHA-256: beff23af2cb6f992ca71f91df5af7ad63f2a23e9593e3baff025431a458a207e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://colegiosantarosa.com/uploads/imagem/file/xupusijov.pdf
    • http://jandebruijn.com/uploadimages/files/ratokilamosejami.pdf
    • https://lotte-ppta.net/beta/assets/file/79965250952.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64f3283f0---16535456704.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8a0771d88ed157044596637efb971f3e/37366750914.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/gojofodemug.pdf
    • http://senkyu.jp/webroot/img/files/sufalomewilinudoveg.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210913_0680BAC06EEBBE9B.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614533a8ebe8c---zomopotedoj.pdf
    • http://myphamasia.net/upload/files/fafewofoxadizup.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/tubirimesebagefawanipo.pdf
    • http://litroshaber.net/resimler/files/xusikepulavelowagas.pdf
    • http://www.pattyn360.com/upload/forum/files/sebevakudilo.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/kamajebakojonoguba.pdf
    • https://alzubidi.com/userfiles/files/jejixerajinab.pdf
    • https://swift-tw.com/lcc/upload/files/63799228907.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28039832473.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b9918e0b---gavewatekut.pdf
    • http://myapartment.de/web/editor/files/gemilukulula.pdf
    • https://hygradeinsulators.com/images/uploads/file/36736498868.pdf
    • https://mertlakustika.cz/images/pages/file/paxojewomuvexokavuriw.pdf
    • http://baohanhranghm.com/upload/img/files/bojigan.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/wokizexixine.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/cmh37kl77eodmmc2eqq0m49fk0/rumisebusaj.pdf
    • https://rentcar888.com/uploads/files/202109061852556094.pdf
    • http://ceresasrl.it/userfiles/files/55408786758.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+escapist+2+pocket+breakout+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc86.bin
ea4f23204b46074f38c99c64d07e3b4796edafd710043f7a2eecb4b20942a1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 16888 bytes
font_01_sfnt_off0000f7fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 16792 bytes
font_02_sfnt_off00011013.bin
4618d74b94e6007bda5937cc0b5fffbdb0f09881581dbcae3ca9650ebc6af26b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 11112 bytes