Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a0d33a9937a701…

MALICIOUS

PDF

96.1 KB Created: 2021-06-27 16:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeb6c78b870563bb45b8e6a38aba3aac SHA-1: 8c24a6f550afc13d7f8fea4315fcef0c80a12a45 SHA-256: 28a0d33a9937a701a2efd757ac895e4d053a682c1d632767598e34ce4bd78f59
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits characteristics of a phishing lure, specifically employing a fake CAPTCHA or human verification prompt to deceive users. It also provides instructions for a password-protected archive, a common tactic to bypass gateway security. The presence of numerous links to compromised WordPress sites and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0495cb6a6---fomewawojofegupamejozun.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/67532774d6f2d4ecf3571b5863c4b9f5/zukunubakebube.pdf
    • https://clubslotalmatriche.com/calcas/file/91027347430.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cdcb158a1da2478a0eac695ec82e1447/9847778095.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a283f02dca724a732b7b6e1f5c4ca388/jexozerekukekalogemiz.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3516c5f5d1---55430332027.pdf
    • https://vmwarts.com/ecovic/file/vuvesur.pdf
    • http://www.sport-konyv.hu/userfiles/file/46662922383.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c6d34b2cfa5115fc34eeeda4fd15d164/fifobobuxavuxu.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/23576946391.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b5k0cca64s12thaajk2ibkj73g/modunir.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7fa38c773---risuluvuzafojureto.pdf
    • http://canadanur.com/resimler/files/61072986497.pdf
    • http://zabradli-znerezu.cz/userfiles/file/fajewiduwudidipareb.pdf
    • http://centrons.com/uploaded/file/4061614960d7b8d00af41.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2e509e371dadce4394d51ebfc2cb5548/63358449499.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/11093226257.pdf
    • http://atol-res.pl/uploads/file/fejosemobejaweraz.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gnndqlsm4e6c981dm2i65f8ag4/zipalalovez.pdf
    • http://vtaky.sk/media/file/67811674710.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/nli42rgoqhu9atr4hgrihgl64a/93662050102.pdf
    • http://e-hematologica.com/users//file/59923675533.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+vc+highly+compressed+android
    • 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_off0000fd45.bin
b46fc7458ff5b3a15deec54051c6b8d5722acfe7f318da3da81ceeffb1ac2f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 17616 bytes
font_01_sfnt_off00012b9b.bin
2dd61bb1469c7662d5e85f76ef63ef0911e1b5bc87e692a8502c217e2d150689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 11180 bytes
font_02_sfnt_off00014572.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 16092 bytes
font_03_sfnt_off00015ab7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB7 16792 bytes

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