Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba80787279633f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 04:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50b213d31eaf481352657fa5517cc2d1 SHA-1: 6ec216171ca01a7ebb17c7c2d187b5298d15d60e SHA-256: a4ba80787279633f5d23561d58515a676f9ae2b1928733a5d8bdc3ee554a9afb
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://veganogle.es/uploads/ckfinder/files/21297115688.pdf
    • https://aspit.ro/imagini_ws/xirojatoge.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f20mip690oobff5qmvorti9k02/foxupedovifuvowifawow.pdf
    • http://fsgzb.com/upfolder/e/files/20210914102902.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/232c43bbee77f388d20a15536b6f9c0b/20484801111.pdf
    • http://pietrek.com/MARCUS/files/file/vufodijevilivig.pdf
    • http://smolninskayahotel.com/userfiles/file/begejovejozopazig.pdf
    • http://logicamail.it/draft/media/xepureporidabifirusu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/349793f825459c059384d2758c8d61ad/sodopuderofawanikijopo.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/punefuvizoniniwibak.pdf
    • https://birsamundapark.in/userfiles/files/vasizovekawakudufogomuze.pdf
    • https://xenang-mitsubishi.com/fckupload/file/67471448128.pdf
    • http://tottazo.com/userfiles/file/nonezemukejanagijimu.pdf
    • http://yidaig.com/uploadfile/file/20210915164719.pdf
    • http://thaisomboonautopart.com/userfiles/files/xalew.pdf
    • https://cingenito.ca/upload/editor/file/pexinogixexotipipuziganud.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/vovatajerowomewejix.pdf
    • http://barudan.hk/UploadFile/file/20210905075112923.pdf
    • http://botosani.ro/img/uploads/file/47674844840.pdf
    • http://sva-jeanroze.com/xmedia/file/suwavura.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334a8a52a1c---gonije.pdf
    • http://www.asap-recruitment.net/upload/file/jatiloxivanexetomadaz.pdf
    • http://brcassociati.com/userfiles/files/27746331075.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5f7f29ee1ea8c9cff14014ec891a4b91/47984759420.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pocket+edition+java+edition+download
    • 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_off0000dc67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 16792 bytes
font_01_sfnt_off0000f479.bin
b552d9300d742e05ef0d8864dcb96a6d6b107d71eb5ee6693f5b3a8ea60ab5c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 17112 bytes
font_02_sfnt_off000120c5.bin
d0821d4a9e96d40720e5cc375aff952589d2a8c60283a7a2e9f55f46a99167ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 10812 bytes