Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d3eb1aea57860…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 10:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12ee0f466355c6b3091827d367696416 SHA-1: bd2665964095afbc14284db1ceb1c2bf59fb7af5 SHA-256: ab4d3eb1aea5786054d2a5a695a893f69b92f3dc899b8781bf798f63b8975c69
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reversetheclocknow.com/ckfinder/userfiles/files/soguzopafelovu.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zogasogir.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d7da8811e88205c166e0bf721f52457b/temawinoj.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f2d1f2e114b87d4c899a940a764055ff/milem.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/25758399115.pdfIn PDF document text
    • http://planetamama.ru/files/file/febeneremapemubitur.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/kagevogoduruporazivik.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/23006261005.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/90901501069.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210821144621_fnecxa.pdfIn PDF document text
    • http://fabtur.ru/upload/files/36600052651.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vbsth1lc2u9ci2742fcgfcq8u5/97101361622.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c198c291684---8048599299.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/58853262157.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/mijutelubunupazepu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t06lmsgmqgr88erqn5tpbujvge/34390172191.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4a68decea799ca6fb2ca9a3a1cd3550a/xifok.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pcv4kumr7fu3ioifp9t5qq0vuo/424660203.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7afdbe05---jinovexez.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dekamefasoxinipano.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/bopamugemel.pdfIn PDF document text
    • http://bscartridge.com/pic/10287201900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=six+sigma+green+belt+test+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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11040 bytes
SHA-256: 37a6e37176850cc7251c66760309dd0a7978d9b7e9d8a0f35b745b2e9fc93a20
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 18372 bytes
SHA-256: ecd1a13316a6a3c8a8b17b4c3e3cd658aa4d6b2a57bbc5f78b7aefc1590d361f