Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e44accdf7e6414…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef84beb62cd13b87b0e64b02186df4c SHA-1: 4f493e6d8ff4c46bbcd6d6eb7d91fa8b0f368de3 SHA-256: 76e44accdf7e641402a80b561535a4e62616bb17d7b9b0032228e7a0dce66d7c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608653d392eaf---momezeboguporujonekeregav.pdf In PDF document text
    • https://zweefvlieg.net/userfiles/file/tesuduwotulimagozuzuponi.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/37929540585.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/rutitoxosakikositixatuxi.pdfIn PDF document text
    • http://erictex.com/ufiles/files/68038107826.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/16140787721.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f16e78f0de1---61695653311.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/53525056123.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d50ede26---mexatiponiredipolizadokod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/puphfg2fmvkgfv65556853moib/50440883796.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/vivimuvosigufi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wanuv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e015c216969---mikelewurive.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/pibumujeboge.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/nujuwel.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/35506519630.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gematisodumudawegajukir.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/jiwoluj.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/juzewilutifox.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fiiqr84m3ehbf6taoomcf0554/pifexezavulotebigopugi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e48a42e7157b67be24a6dbe864c6213f/6158248731.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/dekove.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/75625992801.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/99312057165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=independent+component+analysis+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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 18016 bytes
SHA-256: e4c4b97b3f6149542beb51cf9951bd78b0c6bb55951cf3b2ab2a56af74ed2d4e
font_01_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 10744 bytes
SHA-256: 58dc51f9e3b5f84186f4c0de273fea082c0f618f18c35b33b2b9b75aa032bd24
font_02_sfnt_off00013bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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