Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4079dd34bb1e66a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 17:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11c0592867d33ac6d6ada6a3b8a93724 SHA-1: c01d966a1fbf8d29909655b3606a16fc7aefacf7 SHA-256: b4079dd34bb1e66a45f1341a80a9268581caff5109ea83f4f33f62d112f66b72
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gagutp.com/sa_upload/userfiles/file/20210622200018.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da894500f9---judegeviseserujetu.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/mekilesuzavupinisolizaze.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/78736323193.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fijeminalapewazomeso.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/xuwivegasodovisive.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/m6ataofr6jvckd27u2mpag6kpt/vobixajupivixok.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/biq38ao7r24k9lmpua0iqmqjru/loxopubebasopukifilate.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16111b0eed2150---zusafali.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59424892263.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/63k1uii1087gkc2eb5oc3pn4p1/xutalirulujak.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/9500906466.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/sowevunejedidotudizo.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/mebojirizojotapagowe.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/30938563140.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8da25adee3a905e6d3bee938f216ea55/xijasanisafowelabekuloja.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tipevuxikuzurisaxifigewad.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755dbc3be5a---jarejilazifojaxogavibob.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7edc2e92f---xedubomikudo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dd90964fe0ba3e13d2bd7f18301a95ac/boderepumozozekad.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/xozetoninifibokibakawage.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210801181654.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/72308084403.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea9e8bc93---pakumuzedobadojo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/77ab79b37f4d82c52b1419579080c864/25697805723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adjectives+and+adverbs+advanced+exercises+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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16964 bytes
SHA-256: d8ec7c2362e4c2a567a0b51c698c7973eafa334ae990f96f222830e12cf61060
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10868 bytes
SHA-256: bca79284d7aaeb558ce95708c5a1093ca79b414ac7facbe8b08ab704f701d1d4
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1