Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d5ea2b5a17f036…

MALICIOUS

PDF

100.8 KB Created: 2021-06-13 18:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 41d2d42373df51f038d6ca0f47a4c203 SHA-1: 602241b19b22045720a92e2a53d75fe1f4c87ba7 SHA-256: a2d5ea2b5a17f0363aea04dff76e0bb88cdca6145aaa5e6577ace2cb4cb654c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=what+does+a+cubic+centimeter+look+like PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8de2pq1csupr390hepi8cmfao8/galisutepuxifukini.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/66497603497.pdfIn PDF document text
    • https://angkagenap.com/contents//files/lizugatatudubusejozikul.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/i0hmgtc1eed1om3tj822jjaav0/97309688517.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/403107861585b51dfbb096f1c1ffa1ef/94127002145.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6629215a53ca88096ad4bfc158f7c7cd/50366788994.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ef636047---masat.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2d249899bf96a295459e9d0955f58c36/4704852969.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c339be13f20---74518877103.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a6bbaf85e17ea213c416f842fa228ec8/devurafiko.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be327a85f0b---rududelusajovimosi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c533b20f226---fujufozosilu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/votinutefibinifa.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/83601893473.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4644e9c7b---82158083373.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607757749ec40---16608023912.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 6416 bytes
SHA-256: 62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410
font_01_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 3168 bytes
SHA-256: 4837f756dcd3bad7512df045c701ab6a7ad8ba0c425db1851c577f315fb0e51c
font_02_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 5276 bytes
SHA-256: 87995e9d04656222869329cde99f17aa80c5e341b4089b041a946c69ee1ec935
font_03_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 10868 bytes
SHA-256: 1c6e4a0c7b1d153a3b08a43f3d582220140a0f3605bcceb90aa3d4e4a8763795
font_04_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 12024 bytes
SHA-256: 200271ad74214dbf09693348561335838ef77f4ebf63b294b4507162d945e7a1
font_05_sfnt_off000158a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A9 16348 bytes
SHA-256: 139bb1af2a2c5d54625ae94cf0bb0cd8150d2eedc048d9b44a4a570e5d1b0ed0
font_06_sfnt_off00016e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E76 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_07_sfnt_off00017c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C29 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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