Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b048dcd51b45e42…

MALICIOUS

PDF

142.3 KB Created: 2021-06-29 11:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eaded65de3ecaad94d76f9be3aa9545d SHA-1: 6046a3b00809a0ba973ddaec490bc23b5f93ee24 SHA-256: 0b048dcd51b45e42b7b4962d2770f9dac619fabc1978941cb76531fd787ba4f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host further malicious PDF files. The presence of multiple distinct hosts and the nature of the URLs suggest an attempt to distribute malware or phishing content through a network of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9400

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec227ed7e8---82260835872.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/prkq76n3rj03n9b84k5jqjs0n1/87170577413.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c324fd23db2cab2e97174f6f1a746677/51485415531.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b927db2d825---32534620757.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lizofojosopudapodej.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5a22f5a6---88174862097.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5p2j7kot6lbl2l2r6h46qqug5e/26221926183.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210626_8BAB0C9C248E154A.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/00kk1hcvu60r64qnp7kb728sp7/bovofanepe.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5adab86c7---66043007615.pdf
    • http://absolutelyneon.com/userfiles/file/vubamidaxuboxixasa.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda0537cdb---gixemebafogaz.pdf
    • http://techbis.pl/files/file/fukoditimup.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1883e7e70---welubimowi.pdf
    • https://aashianarealty.com/file/11632769730.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/virofodijiset.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dbc075435815070fe8ee042c7b7b270b/zetewutakewanefotufixazi.pdf
    • http://omonetach.pl/foto/ilustracje/file/sikererowotoxunival.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t1s1ae4bp7bfbb37t4rlmcbnq2/mepavafiwusidusojit.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/20d7100bde573fef30eb107a7cfcb303/17104540174.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b28cd0e88---vigijilonawulinoperunebej.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ac81961e---ranugibudewonero.pdf
    • https://mariellatriolo.it/public/file/57770462643.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8c101e76---76805789844.pdf
    • http://netmutum.com/userfiles/file/32880610391.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97b2c32266bbd76c1522e06fc26dcce1/nevefe.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2ca9be2eb254be4f35a757850bd0bc08/lobanivufaze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sailor+moon+soldiers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B0E 16792 bytes
font_01_sfnt_off0001a325.bin
b313ff912228ae276e59369ff4842ebd470ae1b1b6c2b2f6c84f2761af55c30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A325 10384 bytes
font_02_sfnt_off0001ba79.bin
c503624d3f0a5944fd5f63621b2469d53e7dde00ec8da29d59d1fcc162a873ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA79 18824 bytes
font_03_sfnt_off0001f547.bin
41405819dbe75bf6d2274acd02955b77a506640eeac541a112873ad613768ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F547 21292 bytes

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