Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca573255e2044ae…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 23b83388b6861a95050210a394361aca SHA-1: 01894560b7fa1d44e9210b5bc39a876cd81d9ae0 SHA-256: bca573255e2044ae8c15065fd9fc8a25c710e7b401448440c8b034be0a2dd645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://smidgel.ru/uplcv?utm_term=best+dinner+for+weight+loss PDF link annotation
    • http://mu-rrrc.com/userfiles/file/96858169163.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a882ab218aa---35702863938.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/56866feb41ce5d070c05b471b3b51eb1/wumorawitukek.pdfIn PDF document text
    • https://beaszemin.com/files/87161350716.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b62c7d29e122864e5dd716084d6b27ca/baxipovalilotukerepozug.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jebujipilave.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/39559995302.pdfIn PDF document text
    • http://falerisztika.hu/tmp/gatenika.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/37204638d50ac83f758bbdc85a5656ed/22580747894.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/97638557853.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a188731e4dc---mapatigiriru.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c339f812---kupiremenafadunabuzo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792583b32f5---13994300471.pdfIn PDF document text
    • https://tangentemag.com/img/file/dotudezalupat.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/05ed9ee02cccd667fff3ed5d6030975f/8061204202.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0205160cec---fedomex.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/r0k40c95frbn7v0324sqgo065h/sobalebujoz.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/jirenokagelofumom.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/41696405366.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989bb3f367---zixetewiwa.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/faforidufiduwole.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/serusises.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a2d04ee14757cb15601873878756ee20/31637115382.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e042p0fkecl74o1iomeko1ers7/37428559878.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eac7c153---kididuzitobiwovanil.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2525e042---panajomimuwelakikimokig.pdfIn PDF document text
    • http://learningkey.org/userfiles/73376232400.pdfIn PDF document text
    • 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 10612 bytes
SHA-256: cd46bd7a9a3aef2839fd0f835107a502d53055af6e117f2a7ca17d9c5f7fa48b
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16432 bytes
SHA-256: e339a0a54a9508c14e29f98b087e10ca98844f22f7839915595fac8bbe18d81d
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1