Malicious PDF — malware analysis report

Static analysis result for SHA-256 b361e4bdf58bdc4e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2a89da6681216cbb92805331ba325949 SHA-1: 5b3e2a527dc7b68ae14608ff062a0e6c774f431e SHA-256: b361e4bdf58bdc4e21f47af485aaba09186843a36b48dc9a0ccd66af78860a96
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 0.9988

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://irlanc.ru/uplcv?utm_term=recover+data+after+format+android PDF link annotation
    • http://refah4ter.info/basefile/hotelrefah4terir/files/81944849223.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tawide.pdfIn PDF document text
    • http://bwc.lt/i/48188407809.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/608db4lg6hil1m0l23flfnj237/71407833149.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/859904057d07fc82a3a184b4a3f63120/powipupu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m2cmpi66aisbgo36h5t1rr58pm/25204718141.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/maremelivavesunuv.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/69815168716.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/rabegajekisunabokumux.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e85edc83e0a1c3c0e4136416a3a5870d/limoxumadifevederenetoj.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-4/20210804090652692853.pdfIn PDF document text
    • https://ksuskalology.com/images/file/82795636630.pdfIn PDF document text
    • http://contextuae.com/resimler/files/nexobibegiruva.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/jizubadopunus.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa954207dfd---25419078135.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ecebf13e7ade790f6b0cd55d867db04a/ketonepomesatitiwupevu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bisarexinevade.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/34440931969.pdfIn PDF document text
    • http://3q1p.com/upload/file/210709215050343752327v081h22l4.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/75769520555.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21987c424---53666559516.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/5582469809.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fe78c633---42095283737.pdfIn 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://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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 18508 bytes
SHA-256: 84efce160177fd6fe43902053ffeebe6baf91b1b862ad18f3f1d495b85005125
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10532 bytes
SHA-256: 3f75d44b1f58996faa71f74232c4972ba6858c34e86f978e305e7d442c76b773
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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