Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c05da4ed6fd6ba…

MALICIOUS

PDF

104.0 KB Created: 2021-06-21 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 67796617b601d175b6f97a76d781f146 SHA-1: 02dd74f9b49a7ffcd46abc9dfb60375e0b7c81c5 SHA-256: 12c05da4ed6fd6ba4f02fb68fe2f78fae4b243ca69e9c3e8203dd0e9046eaa5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious payloads or phishing content. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of its specific intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7bc71ddb---zetalezegaxolubifa.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/llbesmdr46h9maijs6belr7tt7/72473698789.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e951eed3bd---3389365864.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/93831086063.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2fb8caa0db52c7224840f1e18e1933da/31599231484.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/63fd80141aa29169b13dbf1da48a38aa/88862316426.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/37e40c89d1d99f73642d22880d5ce211/pexudoturinutot.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3038eb30---26229107264.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c728bcec5---12910404021.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c4c16bb40b67d65aa87ae3b212b776e7/28609442.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4b2b657aa3f05a5b1f1a35b2e3222eaa/98522881030.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/436e009c6b2c01d074fd7157f805acae/94643325176.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2c93eb5ce6d0ea3556d27ae614ff0b9a/32195120273.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/73277883267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cs+1.6+best+cfg+2020PDF 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://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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 6432 bytes
SHA-256: d8f9f47db58992e42547177dfe199b34fc567316a0f663464c5e8d89c1584500
font_01_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 5268 bytes
SHA-256: d77725d4257c478314e2e6969c0a648dfe650cc4e935ce4cd18e9662054eb79d
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 5904 bytes
SHA-256: 73586e030d1864ae757b143c19c8ad4c5f07ba04a6a1957630b0a289b41d48b8
font_03_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 20200 bytes
SHA-256: 259bc8dc233c66f08048a9b6f46ff7467e64b4ec48e79ce4c083a38b758ac6df
font_04_sfnt_off000163ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FF 23004 bytes
SHA-256: a53ae59e20d7ffc96fd43d3311c454b92abcf5f7b9cd6806ccb94c1d7521f3e4

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