Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e026139c2ba37e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 18:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a66c1062c7646da7ebf3967182e02a4 SHA-1: ee8278a4f47d511b0907068e035c4d0cc5bfe6c2 SHA-256: b7e026139c2ba37ec01b9b2297232f9c3608c52fbbf5fc18996832778252807f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sinoscaform.com/upload/ckimg/files/202109260452194715.pdf In PDF document text
    • http://mariamozharova.ru/uploads/files/vulam.pdfIn PDF document text
    • http://hk-keber.de/images/file/sekojidug.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba69635be---vesezu.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wotivaninixafaxukuwu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/53719997639.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/371b9238815d3c158aeadfa9c0f56be2/40719283783.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/xenasuv.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/42561901854.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f771c66bc87247c27e3b26d7397345a7/jogijudaxipi.pdfIn PDF document text
    • http://effekt-film.de/files/file/tuluku.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/39899443476.pdfIn PDF document text
    • http://roocenter.ru/upload/file/70823650968.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/tiwabunuletonanigoxaduk.pdfIn PDF document text
    • http://futboltotal.net/images/files/53855225242.pdfIn PDF document text
    • http://elitk.ru/_files/vorekabuwozibumifunepumix.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/58720248297.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/87583809436.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/39932062383.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sejozunosirik.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jn1l213459ktpi03g3qu44v676/movofukajufunovo.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/piratoxuxixajisijejidap.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463533ac48f---rawebamabarinotufixigap.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/49167127372.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/kizatefanebudo.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/28125311822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+fix+obtaining+ip+address+android+wifi+problemsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 11160 bytes
SHA-256: eb619fbcdf0f6fb73248bac7087c9a8bbca5030ebda9eb4a67cacd145a41fb08
font_01_sfnt_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16568 bytes
SHA-256: c41e7355194f71994b1228feae55ece8bcb983d51119c59121dfd28965a7ca8b
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1