Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35eff61cf11bd58…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1f41428512c710fe9224d4d48a0d49e7 SHA-1: 888065dc6816881687e0f1f4d622234c18c276ed SHA-256: a35eff61cf11bd586d37bd248f68af0a0f78ebfd8e5f7383b447cbe2d3d95c76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with the Spearphishing Attachment and Malicious Link MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8946bdb29---faxapokemoz.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5ab5b99c464271c38614a77eb24bdb58/60273315770.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b5ccb3e68---xivipezusolefegezorug.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160813477056fb---4513778221.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/69393064725.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ump6tourt22akntne2dfbn0mel/5526732907.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/fegijaxofabukamifebi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5cf034893e310817320bafe998db912e/moweginupedivude.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kerogijukuweduwixu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ldpdug9b4d4q8bp4c816shk8em/60147528675.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fulutenilonuzupofobibite.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9d2852116f79b2be04139349acdaac5b/91408558309.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb571f88e---nuvedemaripobi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecadfc7139---80844768034.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/30651644183.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/63c1e71fa48cd1a15115759772b2aec3/pofinipis.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/be5179f85eaef380e7da76f4f30d529c/39663927428.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mozanefef.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77b86c65d---dekinutewixidomolufiwuz.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/647d65f1376ea99498ae707c7f5e91a2/33934018743.pdfIn PDF document text
    • http://klhl.com/userfiles/file/1273300832.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/78915829935.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/tilitajojewesofaxezimive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+a+spoiler+on+the+ramp+buggyPDF 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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 11132 bytes
SHA-256: d46324587b15f52158978c106052f32b4aefcfe2b7e4dac0ded9a4db70616837
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16072 bytes
SHA-256: d1a34d832b169793d0431869e69d2f1fc13afb488b7e21acf6f296b8d0b65261

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