Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828b5f4570eb912…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 18:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fcf3319cb7137960ccf3eaee22c4bac SHA-1: 7c6aa32ab6c9360bb2c985c52e4f319534dd639d SHA-256: e828b5f4570eb91227276a79e162d76f5a92b4aafc47cce20c075467ecf94ef9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of a 'download button' heuristic suggests a lure to entice users to click on these links, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cybernet-ap.com/UserFiles/File/pubakil.pdf In PDF document text
    • http://dansecyr.ca/pdf/file/26623876215.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/1495235329.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0a16370jjbdr71tcomj5ab6n6f/60500557596.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ece17c160---laduvupafifopulojugunimuf.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afbac648b---dufewodijarabavani.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c62e965c128---tewunukefomaseriv.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d5c75b6be---sewim.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e1c6983e7b80b87da957766d3b2da268/36455207189.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/sewitogimibaloxerovorof.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/puwuwatovemutizaxu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707f652d44---11799725144.pdfIn PDF document text
    • http://itfind.ru/uploads/file/lokuzopevixabutotewu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/90316558625.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc4020776---mabavalumafibeturirejo.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/salez.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/dorizowenagogababinowemam.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gn85kputljm6nqikb1a9tgndt0/lanuzivibubasel.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/93901096637.pdfIn PDF document text
    • http://annabarons.lv/files/files/7433615294.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3cca45c031f8e7e49d0377b7624c3e4a/kikedipekenosoto.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/654757620.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/47098040225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tectonic+plate+boundaries+worksheet+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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10992 bytes
SHA-256: 930517b35f905ed8b034ff7cddde7b725ba6ded42071f3f0bd272810034a38b1
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16708 bytes
SHA-256: 897bfcb731fd44bfd7de8ed22d1c02f284b45f9edd8780a87b8f694569ffee1d

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