Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20365525a8be9c0…

MALICIOUS

PDF

90.2 KB Created: 2021-08-07 08:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 587364e0311027fd96ee21e6ff183cc0 SHA-1: 1e2fa0f54b9c24f3712ce5e8fc6e4923594c4316 SHA-256: e20365525a8be9c0f10f6393eb6f1152d2ba281c58c9d09a3bf360b7487375ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://cructi.ru/uplcv?utm_term=what+is+the+difference+between+classical+and+neoclassical+criminology PDF link annotation
    • https://sgcaregiver.org/contents/files/43521547755.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021073018254873499.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/74738468381.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533939f015---noguvemasakikagareguves.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/27558719951.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210504192557.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///togonewavutigitekelerip.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/of89midi1c2835eh0t26lflbju/91738076340.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25130c5ba---rasavoki.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/defunoririgeti.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5tv6gfcqchqm7uvi8j9deice7/mumoganujekila.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1d128e9a9f0b0b12ecc16058fbf7dda2/vijupojiwapaku.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/20927888081.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/mekumonesunumoz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sudirowaguzejotevikurobeb.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/jitageditu.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/13863308187.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ae849a59bc9f98660ca04dc428983d00/pipuk.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c1f3690542f56d7acb5f01313359f8a8/33165447916.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/kezinavapovikogup.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/xarutefefevinosorug.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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 18156 bytes
SHA-256: 34bc998b3dbc27a41f52b624767ffb44096cd658daa1d5fa034a78d609ce2a15
font_01_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 11256 bytes
SHA-256: 87298f0f934f8e5dae026aa19050e28549167d544b07639a24ba77d2e5c86747
font_02_sfnt_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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