Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de4ff4b902aee16…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 03:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bdeab6352292f32d5e01bd04abd56cb8 SHA-1: b3e30c23a6006686396af9f24e969ba4906f6409 SHA-256: 5de4ff4b902aee168b99aa324e39b882ad5959e0cb6e3370d8e80d56a4041872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'laboratory assistant resume pdf' UTM term in one URL indicates a potential phishing lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=laboratory+assistant+resume+pdf PDF link annotation
    • http://sun-green.de/ckfinder/userfiles/files/59484339429.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/zagon.pdfIn PDF document text
    • http://yonetim.e-cari.com/upload/files/leludukedudedewu.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/32513942959.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/abksfkhhouakh5oro2rdp5mni2/29071083927.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/kifajuzetosokipesu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/wevixejigoretugutavatufo.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/74954061492.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/65907633897.pdfIn PDF document text
    • http://vipdiler.ru/files/file/65222434707.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/95678366528.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38e70c028---wivuwidikogifesovagiser.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/2267682899.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/jidoxe.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/96850355338.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zilenupelaniratatonifam.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fatipenuwufutija.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/mizabixabivabewalema.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/46681302478.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/8024280417.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fca8d18275---fovilunef.pdfIn PDF document text
    • http://client.diffuse.info/files/nepowetutevizixeguk.pdfIn PDF document text
    • https://keongracun.org/contents/files/61639749511.pdfIn PDF document text
    • https://activepymes.com/pub/file/39021805019.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_off0000b029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB029 10924 bytes
SHA-256: 4fbbfb3670696763dfa14bfc8f34ba63b05d072ee5a2ea354507690af3fbd721
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16920 bytes
SHA-256: fb08902a3e6671467512caaad7d8321ed5e782826ed1ee06e28c8de6f6fef12a