Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e0b8520015c871…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 15:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3250437a66bb49efc7e48c5dfaa45e62 SHA-1: 17a6e1f711b3e0adc858ee5d4dab8aa5db9a500e SHA-256: 76e0b8520015c8714fdc06ccfd151de4123f3deeeb262f8ce92dcab258601707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=free+all+about+me+worksheets+for+preschoolers PDF link annotation
    • http://zs-oilfieldequip.ru/d/files/2191651560.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9f73f48622eaea0f9253294b1494676e/88908790515.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/63877271591.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6859f5a32aacb14c70fae6423f8d3728/75041713621.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/05fe78f29137186e76638df29af1c016/pujefagudisozadi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/wawapimemusabixilalik.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060300302770.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g849mm0l5o3gop0g23pdjm2rns/sekokafimaji.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/98236853301.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dilebumokivipibekeniwip.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf7b31cba---wupanekefefevuzuwure.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1a8a29ccd664cea9dd0fab939fe725ee/sabokuvesuxaf.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/28727355578.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/dogaligan.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/79894592418.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090212074235.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/dunifebakulopowajifebogon.pdfIn PDF document text
    • https://dintek.eu/uploads/file/kowokimoxeriverunekunuku.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/33389570826.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/sawuviwulovemojesoreraku.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/46718891238.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sozuledijujij.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/akl6mb2gtt9rlrbf65c4ru7afb/54645077281.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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 10944 bytes
SHA-256: 15cab9a47da77810a4cc00e535530ed15b8ed07202895d7e92a9ee2748874979
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 16072 bytes
SHA-256: 4a985885da6903edf508431e7e2508c284318c37de62e6e4e893569218b2ce54

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