Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12bedd83b843876…

MALICIOUS

PDF

73.8 KB Created: 2021-06-27 06:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ba521cd650c057d97e882ccb82eb88f SHA-1: 21d1100f36b161260206586ab126537d8541d8af SHA-256: b12bedd83b843876a6f9ca41c6d449fe52a6ebdeff351f8759824d1faa77606a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis suggest a malicious link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lumieretvie.com/userfiles/file/74382019434.pdf
    • http://seabeachthailand.com/UserFiles/file/saloru.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82f4ead97---bopodupogapopa.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ubh95slh46l01knen9j2v8k177/wuzepuwanolikekalogavazuw.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca62791812---luzule.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0b57e1e0---30945036725.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/faaaa29c12909f3a3b3e2d7530c85fad/77997005542.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae1f72ac7---36444027916.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a54ed1a52c5---82547573114.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fa2395ba---polalotikomefonibabur.pdf
    • http://angelescare.com/userfiles/file/mafufadoforevanati.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4601b4db333ef77bfee24928101fdf22/3071129327.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a9544978037512fc39afee5ded5094/janirimebuworetif.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5a17db1e52a0eeb4269dffa3dbaad096/778231303.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o9v0pa1d5elfn5vk5lk5oqhs2j/67103481720.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb640d32bc---17737442465.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ccdd403a3af8e928fd949a2de8b799c/93975992345.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077faa561aad---81156445207.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7d44c7e8b77853e01241685985079ea4/bitatabikevijuwur.pdf
    • http://applexin.com/ttpsea/files/file/vivevuwokanamoxufinijuwa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d80ed4a0---46936740842.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb691c65e---putebugidu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3e5192c5f8ebe9017d847dd386afb236/tadadomekubulu.pdf
    • http://ytbozhuo.com/upload/file/20060801989.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b848db3e3e3---rewenajifekuduja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=emerald+square+mall+phone+number
    • 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_off0000c28a.bin
56b89005bde5716090b914092c2541990d8bcdfb8574fc364e5510b0608d4f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28A 15288 bytes
font_01_sfnt_off0000e9a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16792 bytes
font_02_sfnt_off000101bd.bin
09b4e598413af299bcbd2d9bf81d33be361467d8e8f5a64970d7560aeb8f11ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10836 bytes