Malicious PDF — malware analysis report

Static analysis result for SHA-256 9595f4f436116454…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 14:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40dccc709ee82af4b236811498a2370f SHA-1: a10beb476c203c5642eb7345b1c778276f447db1 SHA-256: 9595f4f4361164541aeb66b18b32d35c0c8b7a2e2f12c4b7ea9a8a222fc67f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack 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://nomylo.ru/uplcv?utm_term=foreign+policy+analysis+notes+pdf PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c2815d59b---76468246190.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d5693c6bc71---zabadapej.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3fa400a1---39425711636.pdfIn PDF document text
    • http://islandpointfl.com/userimages/21543988760.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/55233099612.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/83094004228.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/36079916379.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/juwalafopukete.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kimisuru.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nexewovarimezodutad.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/vejemubilofaramun.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/19631200106.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbff4e850---vidan.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mj9vj9r1gu2odq55nlk0g6a1ss/nupidasi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/morazifafemotafoduwo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2cff7fb3e---doguju.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4aaa984bd2db48ef19aaa0e29ea343f8/liginemivobu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0696a0bd55---51787469658.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91cca027c---bozezisijokewapufixe.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/busufawajokexopomifudubud.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/96124823874.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/lobarukexajivinat.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7eeb7b7e62b446674572f9ce4b3da258/kujatox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a679098d9d634cae75f50dffbe144511/kijaxegapajojuxudoxim.pdfIn PDF document text
    • http://moristas.com/userfiles/files/ximozal.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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10888 bytes
SHA-256: 728e5614e95bf38b11555dc4a1d1c125f066d70193777982c8c40804a334a5b3
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 17972 bytes
SHA-256: f1dfef8db1ea7adb205a227a4aad4520ef4c9270adedbbad1f295f194e337a36