Malicious PDF — malware analysis report

Static analysis result for SHA-256 64621adfd4ae325d…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 01:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628aed0d893f5cb6687828e0f8853ec9 SHA-1: 870257af90316089a33b4d6bff5c1e7b301cbd41 SHA-256: 64621adfd4ae325db953b6ff0a056c115ee4abdc9929780021e8f6e8301eb5b8
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://jonmechina.com/ckupload/files/xonafifaberatu.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jexafusesogodit.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qpi3d13sjqlsisnsovql44jg5d/detofepimelilazisasopila.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/17034229957.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50105805997.pdf
    • http://dagmare.de/userfiles/file/sufolakufexifix.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/98c68f4c6a12b0c0978670ba5ef30220/popogedoxate.pdf
    • https://clifestyle.net/uploades/userfiles/file/54667865732.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3eb1af35d5cd84e0363c6c988f262541/28081724864.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b70q581phc8amc8eb2v69psnrd/vujujunipifotug.pdf
    • http://talani.nl/userfiles/image/file/texabopolarij.pdf
    • https://aterhesseg.com/up_image/file/wodepalutujupubapakagiga.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723efba20fe---vagub.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11dc1bc9---jiwigoropaboba.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3836voknkum4ji4kv9ilctaklb/fujifirelowovonegaz.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/eun1nj394qtajkg3e82dch19v5/buwujizewinudusidezu.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/664a76e036a1319bf2dd051c5bc6c52b/zaradavubimazowaloze.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd56ef3218---69765000252.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608551c46bbde---79553564469.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b8fb1dca32def5344a8d5da83d52069f/repivikemetu.pdf
    • http://micronforgacsolo.hu/UserFiles/file/49376781951.pdf
    • https://relans-nn.ru/images/docs/file/5364286273.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=class+7+computer+chapter+1+questions+and+answers
    • 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_off0000fcd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 16792 bytes
font_01_sfnt_off000114e6.bin
9669d7a2eaa2128a3110b4357a7ff05e91d5ceede9e3ae5f3279604f02908aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 17744 bytes
font_02_sfnt_off000142c3.bin
512185e3a328b351560d3b1ad22b365a49b45cad7e1d879dd95fa909d5390cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 11244 bytes