Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e628871e348b329…

MALICIOUS

PDF

91.9 KB Created: 2021-08-06 14:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31067ae6d70340df4892e9eef1073658 SHA-1: 3b0edfe506821c3197792e4bee63639c3e34aa64 SHA-256: 6e628871e348b3298ffcd3a05a9c0b708caed1e7d9ace68ff8653417df1bd078
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kd-council.com/upfile/files/zijedepa.pdf
    • http://finpacecuador.com/userfiles/file/79178406732.pdf
    • https://ferado.vn/userfiles/file/76020457535.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2040ef4b99e3ea3e0f64eda7faf49856/vofenitafidemugazofa.pdf
    • http://china-zub.ru/userfiles/file/pijometot.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/05051d573a72dea1297ca053a05f95d8/52119558868.pdf
    • http://zlhk.ru/upload_picture/file/71370888024.pdf
    • http://punaide.com/userfiles/files/tadidakukozuxelijuviwe.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f0b4c637353d619f896020f355a7b53/54509350225.pdf
    • http://boothbayharborshipyard.com/userfiles/file/mubafepogiwarusavi.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489dfbea83---23531599463.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947ca9bb90---jobidorex.pdf
    • https://hospvetcentral.pt/site/upload/file/83927155827.pdf
    • http://maihome.hu/admin1/file/89813318418.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/34930843558.pdf
    • http://redactron.com/userfiles/file/65753586857.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6tabdaub1usgeshogd2s6gtuk0/toromuw.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210726172547.pdf
    • https://espiber.cl/images/uploadedimages/file/7989363070.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/44947913099.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec24019db---ziniwizuvexigunebivujoze.pdf
    • http://czerwoneiczarne.pl/files/file/74527187311.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/12040420212.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b437a424b6c---tepegam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+tab+10.1+64gb+best+price
    • 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_off0000ffd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 16792 bytes
font_01_sfnt_off000117e8.bin
08c32cfbd7c77fd9c044434f28b2e187853e73cfb970cab92d8d0b0bf3b398d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 11616 bytes
font_02_sfnt_off0001335f.bin
7385336dc9d4bc00db0955fd45787e3fac801313e65ae9ff8bdde549fac9a863
pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 17232 bytes