Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef41344598d73fad…

MALICIOUS

PDF

76.0 KB Created: 2021-06-25 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fb185cd4253c067d884e921b2a14d01 SHA-1: 9803a219489b1cfbf3069acb50015aadea194962 SHA-256: ef41344598d73fadb31be381a915478c29a93010bb784ba42a7acc38fe4c31f5
176 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. It contains numerous links pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=hello+neighbor+full+pc', likely serve as lures to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=hello+neighbor+full+pc
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933a3293d03---guropiv.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6341654f9---62576184584.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2c210e8e---tikaragokiwu.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2e702f7e---nuvawafumusodezabo.pdf
    • https://faresaldabbous.com/uploads/files/ruzeguku.pdf
    • http://changju-hotel.com/CKEdit/upload/files/mazemubosipulebotezozu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/10daa36bafffca5dcbff9ba3c5d25d71/bajakejulovijomapajutug.pdf
    • http://dataction.org/demo/dataction/media/82282773179.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c07fa29c2b9482c00191d430af9ab960/tofakinumuzilerig.pdf
    • http://piqiso.ru/userfiles/file/tojutu.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608a158d77fd7---55161740058.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d76478244---segimej.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/o2rpgab3gu8kph66bku2p0e3c5/49852120361.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/14l9lmk363bub77hv1sp8ngdv1/91438932430.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3168f81e---titanimowipetobaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc0.bin
d8380b163a3752c89ef71b943002047db483fd6f0697234ec0353683de7cd9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 4792 bytes
font_01_sfnt_off0000effb.bin
b46194431458266a5d7bebb9b46c333c97f26fd582978c5f44042fc43e3fe8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 10448 bytes
font_02_sfnt_off000113ab.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 4324 bytes