Malicious PDF — malware analysis report

Static analysis result for SHA-256 a059b2ecac1784f3…

MALICIOUS

PDF

150.9 KB Created: 2021-06-15 14:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 77a7a75e8d93513cab890270e5794018 SHA-1: 02bc7b473c16698118a9166d4f3fe6cbdb272572 SHA-256: a059b2ecac1784f3fa7fa479088c437bda33e92bcb31b5ceef5a100bc391b1c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=solid+state+physics+c+kittel+pdf PDF link annotation
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a267e55a---2099994544.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f439cf7c---95856471766.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/98279286221.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/12942f1950e5f9ce039b85b0c1c20ba1/31708030594.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c47190ea3---27129867433.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e5e2ad1f---29146339729.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vatagenejepidubepufip.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ju6mh535tfj4t9277uo7tpro4o/bedabomabizolilefixu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5caa5f712bc9e37de150aa01d8a329bf/tedadujap.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce22c3e6e---razafipobojatif.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bc505992fe9175a8d0d7e9a79e3fee90/17624623197.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/c8816b21fa3a32507d336e86f4cc57f2/leliwazoke.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/89162537121.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b7d18497d593a45ec99e8342c4f49acc/78466309678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC95 5096 bytes
SHA-256: fb79da22e6fbec060ffdbe9213e7a5233b9605390155ccac70a3daf43e0aedde
font_01_sfnt_off0001ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDF8 2920 bytes
SHA-256: a826cd15759f1829322e48458c95f716dcebf2f8ccfe96592ead52aedcdb4a70
font_02_sfnt_off0001e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E98F 16940 bytes
SHA-256: 2e7eca62680f1adfd1b92b34511bd14c228544dbcb8f42450e6110000109fc02
font_03_sfnt_off000222ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222EC 17476 bytes
SHA-256: 0e6c0e14a4e9ab4e4cce60f09d656e872fc1e5edb1339e407a0739b013cc3773
font_04_sfnt_off00023d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D07 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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