Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e784da71c06bda…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e910160ad5fdd402a3c448e6661fe8cd SHA-1: 223a84917183ec5723a63fd4605ee0f2a377fce6 SHA-256: 78e784da71c06bda1c5b78844497035bcb3bc4b8be2988ad02d3b8c702f1c211
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm that points to multiple domains, including compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the ultimate destination or leverage trusted-but-compromised infrastructure. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://asiadomainstore.com/userfiles/file/6794834199.pdf In PDF document text
    • http://olech-rzeszow.pl/userfiles/file/544191364.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d751d621---ruzugovowetubonupaw.pdfIn PDF document text
    • https://ratoempat.com/contents/files/sopileputid.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xepukaj.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/95406614789.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_38C62DA35069D6A8.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/dedulepipotariz.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/68032305492.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bulj3oocdkpnti4knpf442r3/49055721432.pdfIn PDF document text
    • http://llux.vn/uploads/files/66684069977.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/femufurowamegugu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/34090509489.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/vukupabogux.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/39825804935.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/vewutigeminupex.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zowidizarig.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/76070983476.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676992094a---bapezegeb.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/88078866304.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///48203650054.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/34140892035.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/pexuxedizab.pdfIn PDF document text
    • http://acelybio.com/upload/files/damebez.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/28205329000.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/7091323624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mugen+train+telegramPDF 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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 19560 bytes
SHA-256: 13d79ec4b1aa1a1ec6487ae66b3434e10dea7b28c68caba1f388e590325399d4
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 10256 bytes
SHA-256: 3f4f2d44eb59e0629182bc2f87a49fafdb475a8724996436b84240f70a62df21

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