Malicious PDF — malware analysis report

Static analysis result for SHA-256 1230025b847bd1f7…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 15:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe051870fd13d549b33bf1ab58a108cb SHA-1: 3c6181395b3cfbd250392fc5f26fc91c68e41f19 SHA-256: 1230025b847bd1f7534a0c4082a8539955a306a80a666d0b4737478be6979b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://chcial.ru/uplcv?utm_term=odd+and+even+worksheet+ks2 PDF link annotation
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4a38dbe3e---nukimeminili.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb4776b90---gejelofozibag.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/95623914933.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/5104999091.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba6598f64---54357529139.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97371c527---23726874273.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59500518750.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/xagezokoxedewupabone.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744029e690f---49485429522.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/31892787246.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/vasalerijelikunudakagozep.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/pawidoxojoboruziwa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4f7655f497b161fd7b32e8cf246fd09c/butedotuledibij.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5655c0f791a208578879aad58f7e48ae/53633096817.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v580u4rcvii51820tkhhceluv4/bulakatajibesubisuseloseg.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valese.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ui96knc461v3hv29jf46tro0o5/75973495939.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2d31b642a0521a89b52d78b3556073/gememusidalemelijulikafe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ottciuv66e8fkla267vfjs0s81/88805684514.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/39114546889.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/von2d3c4hbl6bm1c7vu9tlk7t7/ribetim.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/78643421158.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626344746ronugilotuzalubuvel.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/89173346734.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a951650b3b1---72619757761.pdfIn PDF document text
    • 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_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 17636 bytes
SHA-256: 9312813c83c5dfe029fd75b1af2e4e02d99109f4c6049b0e070d7e34c5b9ecc5
font_01_sfnt_off0001491a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16131 10596 bytes
SHA-256: 66f6d9beb8bdbc8d40958971d7e8b6e598636defddc3dd8ff191d8585f417aed

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