Malicious PDF — malware analysis report

Static analysis result for SHA-256 acab38acbcf10d3c…

MALICIOUS

PDF

81.4 KB Created: 2021-08-18 23:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf2ea97069cd35f26754993806a41378 SHA-1: 3837c5fbd34b8fc2ff9cd833c7d8d54180f331d9 SHA-256: acab38acbcf10d3c95ca971edea214d5ea2b981d44e310ab327a91537bb20c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://netiko.ge/img/Data/file/xonidafegupi.pdf In PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/7965329883.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/58758013498.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/47942468580.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/959c6cb5fc5c37688fd8d2a577c1c293/repiwebebuvanalibibov.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/dumususari.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vivozogakad.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/13625056907.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa2e1b963---zufakixajezevozeg.pdfIn PDF document text
    • http://ozari-ua.com/files/file/penapakomewe.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/rafabanawixoduledujogo.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gevixadevewomimevorug.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf29bdc76---64249384100.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/45f3028a52d1572c23448839b6090b2d/86705614145.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/49181712287.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/fanatibivopa.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/katako.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b1df8c7bf---41367011066.pdfIn PDF document text
    • http://airmon.hu/images/files/nexed.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/jegarimepajodam.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mipuwide.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/fibudabigeja.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/28768322939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=electrical+wiring+residential+18th+edition+chapter+6+answersPDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 11288 bytes
SHA-256: 4b0951c766d01a32846e84c7c65d0238b7f16f5a4a9e3a26934a16c804aa614a
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 15964 bytes
SHA-256: 4aead28d69b91a4ca0afc9fb7aed6a6a7edf58f886c88a38afaece30afead2f5
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1