Malicious PDF — malware analysis report

Static analysis result for SHA-256 a707ed37b888a266…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 02:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0b9a6d5e5e798e90f0bc44f75c40522b SHA-1: c83628409be5ced4ef10ca6856be4a68eb63d9a9 SHA-256: a707ed37b888a26603f309c53ae641229f0e114e4c50a01710d41e0eb2fff3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting further supports a malicious purpose, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cambodiadriverservice.com/userfiles/file/tatovepelefa.pdf In PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/magetokedoloj.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/33061450209.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/37610982471.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vizuloribalumodaguritawi.pdfIn PDF document text
    • https://majubesar.org/contents/files/jibilarumojarofodesuxa.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/72142031010.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tqe44v3n766hka1kgikjlkut5u/94434927555.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/bakutetepow.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f0536beb---14578133556.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f725badd3---7640111434.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/11433487973.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd00c79460---penojud.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dotuxizujusizedevekud.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/82102391006.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/redumu.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sereranefalejegutivitopiz.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/5976386737.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e62877b277adecb07759548500d4cb37/banijakijibubobegu.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/nidemutamowi.pdfIn PDF document text
    • http://findacommodity.com/upload/file/27611091245.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/81491448695.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43931360272.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/27824203004.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/mages.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+sanskrit+with+meaningPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 10916 bytes
SHA-256: 77b64ccac5ca69fcace24cc189dd2a8f08be083b041b7fbb00c742f1495acdab
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 16292 bytes
SHA-256: 0e98a1d461a96dd9911b2bc482fe093348e1337449cf456a044b2fd6bb90b7ee

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