Malicious PDF — malware analysis report

Static analysis result for SHA-256 04547c7df030ec1b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 03:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de3cce8c8d4c5f5bbe41383461501164 SHA-1: a6af117174421804095131edbe9d0573dcfe7545 SHA-256: 04547c7df030ec1bcbb3ed5db6da81eabda5bf31d6c008a96c7edde8c8808359
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs appear to form a link farm designed to obscure the ultimate destination, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfe2386366---sudalizisozalo.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/94872465490.pdf
    • http://hrjok.com/uploadfile/file/jamoxojapupimupenu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f620e2cbc2---zojapizowisolosepiz.pdf
    • http://parquet-cortes.fr/data/Files/robovusokimina.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc94e76759505b53d230bb4b589243c5/42395886778.pdf
    • http://rasmesafar.net/basefile/basefiles/52734946840.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/7fsqq08lvrtc02vhpkr95gemv6/nabegulejakomatuz.pdf
    • http://chiron-ventures.com/chiron/home/img/upload/files/210620031713638869wne9y.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a046ea4b4b3---dikenev.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/gofimav.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72566063380.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4881f60668---57032605096.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/91854462823.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6569a300e---lokixunevasusirijilusa.pdf
    • http://wccflooring.com/userfiles/files/wasukadaneraj.pdf
    • http://studiotipaldo.com/userfiles/files/muzikutifebelavusoxuja.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6ecddd30488f9a791b0bcbcd53e0892e/16472091562.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9312a0c2c65bfbefab565be16b97b12d/finedo.pdf
    • https://trvstore.com/userfiles/file/mevisikenojado.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2df1572c7---fenusetuvonoxuwa.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1f4ba5d024b476d27219b071663bb7d3/94344898316.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/98249139523.pdf
    • http://colantuono.it/userfiles/files/26737317408.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/53b479b810a6eab467e4797043865471/jefawifudifoxonorepunox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=linux+systemd+tutorial+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_off0000eed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
font_01_sfnt_off000106ea.bin
d5f5af04712a3602c090bd448400fe7b226a70c8bc61945f60fb81a7456cb277
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 18380 bytes
font_02_sfnt_off00013756.bin
f7b77a0cb44eb534c5a044b3b14c929728b908558c25182160bac7e9a84c7069
pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 10932 bytes