Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd898b5571edc0e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 10:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dcd045532c952d7daf76bf071ffa058 SHA-1: 96b91fb180ff83668a8b84f06876421c629e2858 SHA-256: 9dd898b5571edc0e0dca3afc17fd93ae918805e55bfe22fd09d22825dda2051f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11810fdb7---10284812054.pdf
    • http://www.sport-konyv.hu/userfiles/file/fovokotexuteveboremabipe.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40659120184.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/moeoe4nnkh4a54d5hmahl9gg73/53031807907.pdf
    • http://studioingegneramato.com/userfiles/files/vefijarom.pdf
    • http://globalbando.com/DATA/upload/files/202107090005511161.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/74068514989.pdf
    • https://hotelgaric.com/upload/datoteke/kivigetilitabekaxagakadix.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/8542615353.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbef99dbe2d---89491908449.pdf
    • http://eternalcycle.com/FCKFiles/file/60476223495.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deeb9daf4d9---96952133465.pdf
    • https://tcremich.lu/files/files/kujede.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89227a79f1b84e36466f69b9a4ed9946/vizunorebiwuwezosexebut.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f13dc860---60466546861.pdf
    • http://casavacanzesanvito.eu/userfiles/files/60008473536.pdf
    • http://robbes.nl/media/files/39876992689.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080930ed43d9---lodegader.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072d099669ce---zogewadipiminabevog.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160814c4eecbbb---matuwijelobukisegonal.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/wafofifujorevaregufepig.pdf
    • http://bannermaul.com/userData/board/file/safapik.pdf
    • https://netwindowvn.com/uploads/userfiles/file/sezelawiruwiw.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-8-19/20210819043644937186.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=technology+in+special+education+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_off0000e22f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 16792 bytes
font_01_sfnt_off0000fa41.bin
e081abc358631000c6fdb4a873034ee2c4c0b9489d0576ca9e65a8a5a973c54a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 17188 bytes
font_02_sfnt_off0001266d.bin
5de6fbaf71a9f72ed1d686ce41de87b81431e609cb8386ab30ebbdd060745cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10976 bytes