Malicious PDF — malware analysis report

Static analysis result for SHA-256 58abee9e8fad18ad…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 20:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fd5cce6dffd22ee0314ebc94378552f SHA-1: 901f046d2d5ba0da8c31ccad04a421416cfdb78a SHA-256: 58abee9e8fad18ad6435ddb6664451d2ed968680d31050a2e50fef10372ca0d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://xn--aknmedcal-wpbe.com/uploads/file/86071172851.pdf In PDF document text
    • http://tnetimes.kr/upload/file///linolodojogexawuxalepe.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/fuvoriragamafalafapuwaje.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/gidibavuwapiponoxuzigaduf.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/poxurafojuvefusozod.pdfIn PDF document text
    • http://theponghop.com/upload/files/wamupobuzikeriv.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/57441168541.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23ceae4d1---19333834242.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/xusopu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/99513571856.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/jujit.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210620082932.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/45606871536.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/67550555599.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/13a2ac66b8669743b35e2cfed3e2145b/lodeniwatexidenize.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/62b392bad9ed1a4e62554e4e67bc854b/91119285323.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98858ec6a---vatejogidus.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/91370311624.pdfIn PDF document text
    • https://ubranni.com/uploader/files/88103559743.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f0fad5ddf5995bbf9391f085d87f64fb/totiwigesanezot.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076890679962---85022163709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=landslide+ukulele+chords+pdfPDF 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10768 bytes
SHA-256: c822e3e7743702f4198ae5193255f4883fe002d458664b746c4e6e66508bc61e
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 19652 bytes
SHA-256: 8c713493e39db5efbf7244049d2a02b80aad160d86483efba5e70decb0ffc7a6