Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1b7a43a5b3363a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-10 01:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83be884327dea00fe0bf145b9a6544bd SHA-1: 56eed4462f86a5fe9339becffcb2b9da86ba56e0 SHA-256: de1b7a43a5b3363a3628297b4529d4bcabacc76f2bab9bfb67537d191a871ef7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adasms.fr/userfiles/file/zevubebabekewetazad.pdf
    • https://ivanda-commerce.hr/userfiles/file/witibuzigebozazekuzuk.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ecea1b1e7---savefoxawajakenabikefo.pdf
    • https://twr1115.net/files/fckeditor/file/fupakejabelizivavez.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094603b9e70b---zuxeburowavesimatif.pdf
    • https://liur-krd.ru/userfiles/file/43458124151.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a730a8e6da8ff475d0c2e86a44c931df/88762331675.pdf
    • http://collegium-connect.nl/ckupload/files/89950066408.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7fff9a5669bbaab7834895c8bdc0d615/refukejufojozube.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e67628d0bb9---55547123349.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160945998b16ed---mavezukitedumidewifilif.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/be9erls339at9tv26eue70vht5/tomex.pdf
    • http://inwallendorf.de/userfiles/file/derefaziriditufet.pdf
    • http://rcp-ranstadt.us/files/73196079859.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b3cb6d69---daxajek.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/zidus.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a1b7f4d---41298112.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1483d2738b---jukibesetu.pdf
    • http://cherryontop.pl/upload/fotki/file/64777150943.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa70b5dc5---bemofovir.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7m5j1mh4nkohuf5drh7bck9eaf/90453940584.pdf
    • http://ghalemdi.com/userfiles/file/pufozel.pdf
    • https://prtl.pl/userfiles/file/79551342165.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a322464b915---jazupodapudizujigipulebov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+palace+of+whitehall
    • 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_off0000f6ff.bin
be5be4665ccd40aecb7124d91e277316c631734d597682eb205ee29179cfb0da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10256 bytes
font_01_sfnt_off00010e43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 16792 bytes
font_02_sfnt_off00012655.bin
52d9148a49cd62024a245df9420451a80510bb98bb30aa9d5eb26b2e31077b94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 19092 bytes