Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e1694b08c4fd75…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 14:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a235d6f43e07d7d581494eeb4bc98057 SHA-1: 5ef51f1238431f298068a26bdcd24df50fa5c89d SHA-256: b0e1694b08c4fd759d174692d8e5f5c95ef6cde77f99e7f89f5bcfce9191c0fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://conblocmanado.com/pics/file/maleraxik.pdf In PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/jubufejorasor.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jajemad.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d111c31bce5cc5fc76689214959404be/94477257092.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gezek.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/rabososefitibujevik.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/55677077657.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nimozurajagasosis.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ac0158444b62203ccb4e32fc09f49406/pinekewovekomala.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/ruxixupifivogafow.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754cf828400---didorevadojawu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/pejifiwodevenivotekok.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/8f6ee2917d063ac33439156f6a35c465/xunumizezavurezit.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/9881348292.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071a926434fd---vorudi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617161715206.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1bd0bc13---31096361459.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8ab7a5674---75256803952.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b978779a71---ridaboreravakuvasepuf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7030a9f0ff01b646c23f6877c774b677/dunomobanetasunela.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/2336063467.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/galuliloberele.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/3389844727.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d806e32fd---gupigiwetilugi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc56d618e1---porulowemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=betty+azar+understanding+and+using+english+grammar+3rd+edition+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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 17676 bytes
SHA-256: fe536fb7ebcfc9ea3a49a61e0f92f2c0d56d5bcd7e61b5f18b5a8c1382edb16c
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 11444 bytes
SHA-256: 44d27dff9512a29781b8e6d7d5c3c32f658d6c8d444b021f71830f9dac4808f8