Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccf7241974a5e5c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-25 17:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f143e22bf99c4855a1b60cd42372249f SHA-1: 4ef7aa04efba3af65c872139ebebfa8d61f733b5 SHA-256: eccf7241974a5e5c3167ea8d839dded748ef60435dbff94cfd2aa3daef8badfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to compromised WordPress sites that host further PDF files. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting malicious content on compromised or disposable infrastructure. The primary attack vector is likely spearphishing, with the PDF serving as an attachment to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079904cc51e7---kudedejevib.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/96be64a0f0fe6bac598ba00236475d74/2293100969.pdf
    • http://bagiez.com/userfiles/file/94441500288.pdf
    • http://koreanhotpot.com/uploads/files/31324161991.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/25a188021cbf3f0779032f19d8ea9ddd/nekizomap.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb267e2765---788654642.pdf
    • http://aweibel.com/Photo/file/vegugonamexa.pdf
    • https://cakenepal.com/userfiles/file/gitibifepikagowuri.pdf
    • http://sclifeguards.com/clients/16854/File/dutuziruzizizop.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160789f0b3123d---41719265863.pdf
    • http://yishiweb.com/upfiles/files/20210621_121530.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e803ae5b3---pisuserifumanasot.pdf
    • https://ridersshop.it/file/65311105235.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/632d4e4075ed7da5888265e10adb6af6/32498784960.pdf
    • http://bettaletroom.com/file_media/file_image/file/zelifiromumegoxew.pdf
    • https://amrapalispot.com/userfiles/file/78745082074.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609da85992bba---dasakukibodiganusoduxidaf.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81c595dd9---jexab.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/583aa0cf30eeae36a49fd82dfa3437f1/80289996718.pdf
    • http://jshtextile.com/UserFiles/file///fapozereru.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexusotoxudoruxunej.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/0623ed0bf66caa363a849527f4d008f2/loxazexopiwipatudofo.pdf
    • https://stmarys-perthamboy.com/upload/File/66789202478.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c739747---31686046726.pdf
    • http://sjar-tech.com/uploadfile/file///2021052506384647.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/15478412229.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=simple+present+tense+affirmative+and+negative+exercises
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e797.bin
5bb65fcadbd8e3b4a01729bebe639553fe5c10b3774c005dcd0da68db1a1f35e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16540 bytes
font_01_sfnt_off000111d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
font_02_sfnt_off000129f0.bin
c3048a12e282eb5508696c4ee28661b6504c094df5b3220e0df95aaa53ec6f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 11084 bytes