Malicious PDF — malware analysis report

Static analysis result for SHA-256 3404d4bf82a12ecf…

MALICIOUS

PDF

121.0 KB Created: 2021-06-19 01:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cd5a3695c8d052f7e1817003fbd24ce6 SHA-1: 9e1746675392f16fc7376a990e435c22a27596ca SHA-256: 3404d4bf82a12ecfa5db1e1ac4d9ad3c0ed34452d6e773ac8da41a75700251df
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 0.9990

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 https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/bd89b785634a0793be41f7ed3b2e50e7/52155987386.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a7e34155---14135455887.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/i8jdlnviql4jae18fkpbfjjrgo/ligexumilamigalited.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gj3pnu9csrsun5k5qvvui8gcrh/wezoxosexotoxipesemibu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/91463496057.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97e2c08e2---736109515.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa4eaccc7---86467812655.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/50293102809.pdfIn PDF document text
    • http://sport-jicin.cz/dokumenty/bisanumibatazagafunub.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/pizuxemetaxen.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/26be816f305037c6347d49c334f8febb/75129685244.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c1631be5---gezixunadaragezimutugeze.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a534e80003eb33cb439e497de5a4b7cd/18829341461.pdfIn PDF document text
    • https://isosklo.cz./uploads/96842497329.pdfIn PDF document text
    • https://defaico.com/d/files/29024131601.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/30010733243.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653ccf165d---volaxedukisabasefuboxalow.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/zevujinetolaguniloz.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/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=opentalk+cracked+apkPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b36f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B36F 20304 bytes
SHA-256: e3a9d4b414469a5509145be9c5fd0deb6bf1ee32930b0599755fafeee96736fe
font_00_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 40088 bytes
SHA-256: d16da0248abe169b7d254d700bfcf462fe1aba81c52dd72719d1911abf46bc95
font_01_sfnt_off00016a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 4980 bytes
SHA-256: 257f17258efecb3197cba09ea0b6c866459e9aa603904813e34d953b398f647b
font_02_sfnt_off00017b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off000183c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C9 15728 bytes
SHA-256: 3d1948c07fac7daaaa852d50bc38b2aa8cbbc413b94e8c15ec73c5a6e45881b1

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