Malicious PDF — malware analysis report

Static analysis result for SHA-256 7900c2c8beb109df…

MALICIOUS

PDF

101.4 KB Created: 2021-07-16 01:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e590e58b5f43862e57d516c39c0104d8 SHA-1: a589a05af21c52dd52e629466f47876cc1d5cbdc SHA-256: 7900c2c8beb109df028503db10089d93a9e30b8a7bf062f93dc7846061afb20c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://ecogestval.com/userfiles/file/26844558639.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/visuxopabunojoludibiteza.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d2ddb1c87b641a46090872e6a16615d0/73316111938.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/37945c76343d3819455d8b2a86462c18/vemuli.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f7d1dbd12f98147e33bfb06490a47710/safebidemonazedag.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7c4f320bc65335d3ec69f6eba17f42ee/72330932960.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6533a7bb14---wolawasij.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rozibewo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2a4abc31---23528376634.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/28584b3a50b987c729353d5886bdfc62/86603195849.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd05a8529d---pogesezenexovowugesovoj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0jev1dotcplv55smj774o8997n/92390281383.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb19fb4862---zoxarategirizexalenoboguj.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/jojapolamigibunozud.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb9408dfe---fidebajigolexusax.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/fijilifu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/wokepavamafaxovulufigamor.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c102e709---36346821388.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/wugogize.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hdgbt5ptp4dj5f55fh7o0a0dar/48710570127.pdfIn PDF document text
    • https://maturana.cl/upload/file/dusewomunanamapazopaf.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2carpua10cbvrc57mfkeqh1hf/60622863932.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/jezegijofusaradedibip.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b674d135d---zaxojexubulipufoxutisu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kinutepawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=existing+advocacy+pertaining+to+information+literacyPDF 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_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 11228 bytes
SHA-256: 584b2f9a1616dcb7d542fc43f59c64a01fd05ed8ffdd9a39f81474380e105c81
font_01_sfnt_off000142fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0D 17104 bytes
SHA-256: 412a0fb598f75a2f16e21fbbfeacedb344fe91bcdd04c29da1b159e56bca274d