Malicious PDF — malware analysis report

Static analysis result for SHA-256 29679a31f469578f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 04:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fd2c1d36d27b6576b884d3c1b121d28 SHA-1: 479274be6ddd141c851e26d653101e7744330c87 SHA-256: 29679a31f469578f03f6c88e2a5d3ef4c4ea77dbcc808e525acdd8d9fa980c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=icare+health+monitor+full+version+apk', are designed to lure users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=icare+health+monitor+full+version+apk PDF link annotation
    • https://hnhaa.com/userfiles/tnejp/files/96259661842.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/85535099892.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/26344119592.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140edb9bc38d---loxuguwisajodelutemesak.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/72253417659.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/8324895121.pdfIn PDF document text
    • http://hijoin.hu/editor_up/vujimem.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/jizexugunuxilofepev.pdfIn PDF document text
    • https://armenia4d.com/contents/files/nevisuv.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nepusiti.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/20558802838.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/47944540990.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/22643185246.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/fobivukomekagevurometow.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/89682294525.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161395c4865799---wajukuvosejopetipak.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jemokabegavonivumabom.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/75219053398.pdfIn PDF document text
    • http://nenorm.com/files/files/gasidip.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/lepijijonefipuda.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382207260b9---jajolekadakukugugiga.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/dufife.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lonitojinabojatu.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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 10956 bytes
SHA-256: c7e87d464875070a104de8a977a76352bfeb9d2ec3c88569ba6cd804ffa6e7cd
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 18156 bytes
SHA-256: df4e34af03d28d1a528c8cf509b9a1f54bb03de570e458f3d59fd1f03203ac67
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1