Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbb67bac0c7e43e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 17:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8241337eef0ff8aa7d1d94b1c9adf0d SHA-1: c3797f2c640287d6fb34d9d1f404a1e7c12704ea SHA-256: fdbb67bac0c7e43ea289455d2dc46fc60e98460f46b05ca9602e64d71e3d50e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some of which are hosted on disposable domains or compromised CMS uploads. These links likely serve as a distribution point for phishing lures or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=toner+processing+time PDF link annotation
    • https://magnettoptan.com/upload/ckfinder/files/xumoriwogelafu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16151e7e7aa81b---86001070699.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jovenawoxozenalisavoto.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/13637773960.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/8146302743.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/nedakujejefapasumidadim.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210904055251318.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed263dfc1---rilovi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/30638269021.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/belenaxodinatul.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150036aa2f64---99276496253.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ee48f567---dimuwebejixiwitu.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/pijepoginiwakoma.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4829_20210913135316.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tekeluzixidara.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/56739167259.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/vexewebaxinovonijaviwam.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/6353678564.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905140038.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210910100655_829811078.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/40180225347.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/78642360928.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/zofaderixovazuxave.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/14549783500.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/61066424406.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9001de780418f639cde729afe27d5d5c/23105399354.pdfIn PDF document text
    • 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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 10472 bytes
SHA-256: 2b758e07d72f889abcb0b88e636a82912325512bcc55e0fae4532251282e4e91
font_01_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 15556 bytes
SHA-256: 23a1756350916a0b2d571e0ed98b95c69853787f2ddb1336d0ab260e2ce8aab9
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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