Malicious PDF — malware analysis report

Static analysis result for SHA-256 6873fdb5eaf92810…

MALICIOUS

PDF

93.8 KB Created: 2021-07-01 10:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f87491da2dcd4bb0a1219716ac811063 SHA-1: b911c36fda408d14141678c5d990eb85ead0b8aa SHA-256: 6873fdb5eaf928100f8ba8a1ff3f7d31a54dfd4361f531329846cb9cbe85d334
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution scheme. The file's structure and content suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=sulfites+in+coffee PDF link annotation
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/62192682912.pdfIn PDF document text
    • http://sns.hu/_user/file/wazoxizodopibinubexideje.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899e9b2f04---56830903807.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/33645323918.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ff05da94170141d22e9a0b74f5caa7d4/fivurubud.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/81b348415c677e2730f966fd3168e065/muvoxorazuz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kemexikonaxalirijubomeda.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/61dd88e33e3584166f98cab47bec13da/maregukirosir.pdfIn PDF document text
    • http://cke.hk/userfiles/sineli.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc0e4f0e9---21009723437.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/66228257297.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vejudowewiwe.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed7a89088---tuwofanis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aced4dfea6---32366228679.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1503e8c43d---61127362370.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c30890bd40a---nujubisuwerizalibi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/34669766486.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074775c954c1---xanovisevu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e2f7c849972ab0f7d2ba407830f3dfab/vezovukofevakasovi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc68b802b4---japirutesulotexizukoboj.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/23/file/20210623_031219_158.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/59506199319.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/8404881502.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l3n2jk4pa7l1ebqnoagjpocimm/radixapow.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_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 10240 bytes
SHA-256: 37b9448e3056fd4c8f4be64d0b56339253854fddee122299f1c029a7a939f26f
font_02_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 16828 bytes
SHA-256: c336f889fe1f166823e3c41b339d3e1dd85db722979ac6aa3161371b52108b98

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