Malicious PDF — malware analysis report

Static analysis result for SHA-256 d167e7a4161fae46…

MALICIOUS

PDF

143.2 KB Created: 2021-08-05 12:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58418e07edb5e94f948496a54dd510af SHA-1: 85ad12e4696b29f7d9b623e8f6be6ae22ec78eb1 SHA-256: d167e7a4161fae46b23e444ad6a1be75f0ac44c56c61026fe78252c7c5874efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests the PDF is likely used for phishing or to distribute further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

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://queure.ru/uplcv?utm_term=scary+stories+to+tell+in+the+dark+book+online PDF link annotation
    • http://donghozibistore.com/luutru/files/2741749459.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/376bd9c2835d157ffe6e5deae7ffc76e/xodikimetapitibijikeb.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e85c7ba7eebcc6903d7a0be1827310be/27339136917.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/38222486027.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/53rsj8g9ghtfn7mdgubblfqf9e/61357308446.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa7842e0---sajonudipadumexuvepusiz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a22576f7b3dcf659f66ee03ffa96cde/mujimaroretigekivobaxa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/saeep4af310vbd9grjc0iudfs0/75691922237.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/guwimibodugiti.pdfIn PDF document text
    • http://nenorm.com/files/files/68259352634.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/17919529809.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/52889704147.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/pezadezopawifexanixi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997e0b148e---72519350402.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/52628727949.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/somopununijawe.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/dotinegemizafenaxegenar.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b020497b386---nelikumixemutorejapeze.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/gafosaxazavegarafajiralej.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/67311794154.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb709e80c---88759397420.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nomusofonebavuzifebiwuvo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcf9b5ef558e3e82ef575869d56f820/75706974373.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160875f93972c7---pirapij.pdfIn PDF document text
    • http://scro.ru/pic/file/wobesiguka.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4fd24527---vemijudisagipelitikosori.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_off0001cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEE 10888 bytes
SHA-256: cfdd7666c3c198a4d8a723bbc541214d75c0a1518e6e49849e2100c3f8747937
font_01_sfnt_off0001e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6FE 17336 bytes
SHA-256: 3a4f383fc93b2eb67cd5e90a0add838cc7c53bb86e900514afe6ca49b9dfa46f
font_02_sfnt_off0002142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2142F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1