Malicious PDF — malware analysis report

Static analysis result for SHA-256 d989b28d559d629e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 22:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6e24a290048ef0140d2620c856d7fdd SHA-1: 02b1bf35c86149b8e1a30a2094826a8a510e1cab SHA-256: d989b28d559d629e3ca3ac6a52398c6665973cddeab789da58dc212f046e1659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scamming. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=string+quartet+wedding+songs+pdf
    • http://aptekadc.pl/userfiles/userfile/88416737227.pdf
    • https://mokshadhamnepal.org/userfiles/files/30321086867.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baddb616ad---bivojobevabakevexexazav.pdf
    • http://nuestratierrapremios.com/campannas/file/mupogojuwafivotasetusar.pdf
    • http://www.niziointerior.pl/upload/file/nozewebuwenuvakawerab.pdf
    • http://erulingua.hu/uploads/content_files/files/2863357007.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jazurolizepux.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/7191946503.pdf
    • https://pabrikangka.com/contents//files/kukaxovededirujosep.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/fesejuvopawebiwazavifor.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0k658v4fu9j8pgpbvphbj64s43/56182389429.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/liratawobifupexibosuf.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763221e889b---11489941511.pdf
    • http://transinfosoft.com/userfiles/file/jolonelododufatezim.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c4f6a91e---93751699779.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074aa5b30bdb---ranusokinugafugibidibibal.pdf
    • http://tongkhomica.com/upload/files/wuzubozekifemafe.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/pojob.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2t880af43hfo5p49m2f4lmrgf7/kexugabuvixukaxolagap.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9958e6bb47---xapigovegebelulow.pdf
    • http://keacg.com/upload/files/laxabufupifumugogaj.pdf
    • http://cupta.org/userfiles/files/20210616003801.pdf
    • http://velisend.ru/photos/file/topesesimipat.pdf
    • 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_off0000e7ab.bin
e8274dfe80e1945d0435ed203ca14621b384dfc14783e329f51ab73c376ec801
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 11036 bytes
font_01_sfnt_off000100fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes
font_02_sfnt_off00011910.bin
81fc371318c79e962ce5674e30dc10c3d0b55d58a9292d59fa85d7af376ef679
pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 17260 bytes