Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7543ba5703e2fb7…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 16:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b9cf55748a42dad59c9bbc86de8fac0 SHA-1: 87218e24708804a066c7648f5bfaa7b26eedb837 SHA-256: e7543ba5703e2fb75b93a79da9586cc3048df39e16472e4daa81715f68eca8cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and link farm heuristics point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qmhmhplcc57vgq3uootfop3ute/89307880930.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974b36a503b---fiwuveziwuvajalo.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901b794b696---dixudefebowotowogur.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa04385ca0---88985471283.pdf
    • http://alpha-cp.com/userfiles/file/4129628198.pdf
    • http://debden.org/userfiles/file/67465582594.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6f452b89---genukokunaf.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/87778cc6587af86e9fcabd5652fbeb51/61148458474.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4235d7a33d8d1b2e51e964445b02c1fd/57532432176.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/61a1693f60a34c7b43d69b5a8ea4bbbb/76554219846.pdf
    • http://evola.it/userfiles/files/47666792456.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d318c0495f---kozibotobiroza.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/70em5vcs0cm36pcpjv94t6lhjo/tagul.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tofovufuridufifeno.pdf
    • http://boathousebrokerage.com/userfiles/file/jodixifololifenisiw.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3140eb783e00dddafbfadb64f6efb642/funerizumagu.pdf
    • http://naucseto.cz/storage/5831038049.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebaadb3ed---fabunogijomiwofigiku.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/cecf852e803abae04224f42ab88cef60/51994976860.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/342093c6d151ed124748c04d745c613f/vuxoxosafoveviwob.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6a79afe8---wivopurefozoxilemut.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/dowode.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b8b000ec---37874713293.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+compiler+for+all+programming+languages
    • 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_off0000f638.bin
936fbf233c3ec80bbc32e3a293931eb1ede7f9118e5261daab752c2c0b016a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10976 bytes
font_01_sfnt_off00010fbb.bin
ed04192f76df5c855cb3a2ff7965339b556e9d666d5bdfbc184be9dfc8007c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 17600 bytes
font_02_sfnt_off00013dee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 16792 bytes
font_03_sfnt_off000155ff.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155FF 16392 bytes

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