Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8455eab383248c7…

MALICIOUS

PDF

102.4 KB Created: 2021-07-16 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6a1e68fe69d0829d2a6b9426c411d77 SHA-1: 6ad7ef00d53672458e6c6482053a3b805292c701 SHA-256: b8455eab383248c7556d6d08c9fefd72e9c929ed613d8b41f23388e16e8d1378
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://hit-air.pro/ckfinder/userfiles/files/22828708230.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/1078864604.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e223062f2---nitasub.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f25f4ed24---bixukesadezowi.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/44512492337.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/70435494170.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510060154.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/66203077.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/75409052374.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/do3n3le5kcsndu9bk0daglimr8/70767987097.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9101565ecb6796f8b1a0c50897b0b39d/roniba.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zupamixedunujow.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/26828429706.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/45689606643.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/14108937245.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/limezeva.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d993e06c---binivudoparofabowufomuje.pdfIn PDF document text
    • http://skomi.ru/img/files/file/ladazajavazolidebev.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf13d9e5bef87ca80b7f6c1c0c8aeb5/nimitudojun.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/24123500439992947e84c629bb3f74c9/71515582058.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wojonetufusi.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/tezapaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=blue+exorcist+girl+with+red+hairPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 16896 bytes
SHA-256: 94e1b69c8eabff05c079911bfd1423ad17ec002d728a5619ced16e432fba725a
font_02_sfnt_off0001658d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658D 2604 bytes
SHA-256: 62d67103bff56e7c6f7e0b5f29355f56e1fe107b8a72e20caba9eba5adb607e6
font_03_sfnt_off000170b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B1 10888 bytes
SHA-256: 5c3895054d9657281907a10ef50e2582422d547b0089b35b3cce03444b4d6c1f

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