Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd30d1baa34c4e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 15:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a876c6e19b8c2b4088e1c7640c0c3be SHA-1: 53f8fe22e0e1ed31fe37bbf70ccb0111c569c055 SHA-256: 5bdd30d1baa34c4e3e9129d0ed17e1dfcfdc8d46b881d6c6595347da057a30e1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8fa993dd---43818550237.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sssbdt3i83srq2htjkrjp15fgi/kikimejipupavosibukol.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/58060832830.pdf
    • http://alphasigmaoverseas.com/userfiles/file/29436144141.pdf
    • http://biafrapol.pl/pliki/file/turituxufifuwijase.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/841c2d325dd210fbf58c6be22a752302/nodugekazakorinikedidewe.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4cfbf232---kikutipozomivamuroto.pdf
    • http://chinalanpa.com/images/upload/File/xajetajavesupirewakeri.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a36d0c8f413426edbc9f36acc77cb11e/5792856333.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5bc882e8---womuvojedoxufilutesiluba.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4126a68c1b---64939052825.pdf
    • https://aawyx.com/sites/default/imageuser/file/wulorapite.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/guzetimetesodi.pdf
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/konagesi.pdf
    • http://qzgj.cn/upload/file/bonilu.pdf
    • http://rund.cz/UserFiles/File/7236337212.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd20b1dd2---gegidozak.pdf
    • http://asbufestival.com/uploads/FCK_files/file/71749088946.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3a33d6a5bbf8f08025634bfaf710976/zedukuzumokusuduzatuboba.pdf
    • http://beijinghuojia.cn/userfiles/file/zuwusizovivezelapineza.pdf
    • http://kristenpell.com/userfiles/files/savagalamelokulek.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1a9738df---56382506387.pdf
    • http://www.hydro-tg.pro/upload/file/bafav.pdf
    • http://mobiliteit.nu/files/pitovovidunoref.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=depth+first+search+tree+traversal
    • 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_off0000d933.bin
5ee816ab693fa2e2baa68883c28679355c5a8815569c980dca6942016b482eda
pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10420 bytes
font_01_sfnt_off0000f104.bin
aa39ecddff49a8a0fa7ac89132e431f6e77c8326dd92a196afa6b39247d67199
pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 19112 bytes
font_02_sfnt_off00012339.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes