Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c637fca7b1aafa…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 02:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cea6a17cf6f8acbf6015838fe81bc6f SHA-1: 5a8a5d8cf544f1b325b7b4adacc96fd9de71de1a SHA-256: a2c637fca7b1aafa929aa6ae3a81127a6fd505e552052fe63340ad5cbbec5277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=pengertian+pencemaran+udara+pdf PDF link annotation
    • https://zhansq.cn/upload/file/vezufuzedumeki.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b3ed6d36---51772103851.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/betotexesuku.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e7a5ce1---97542976633.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2a1b23a597242dd05eafeb1e0af859/62687925319.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/82942729397.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4bfd6a616aae1ef489a22a92aba457e8/dupagulezegow.pdfIn PDF document text
    • http://upakuika.com/img/file/mitowuf.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/nurupup.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ditefipopamib.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0052c50046f7fdf677fdeb978df69a78/91642580853.pdfIn PDF document text
    • http://kisito.com/userfiles/file/defiwojozogawuxud.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540f9f0aa9---rabixujunadetida.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j7a31qpe1optd1iij4sb5rs294/44132987837.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/57544921078.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210830085138391.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/30876ri1se086h1q26ojuksnod/kowakazadekovuzokolana.pdfIn PDF document text
    • http://dentherapia.hu/files/file/76612014096.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/69021528733.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/zedotetedok.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f3141eca---306906543.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36baf27956---dibesotoruk.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/18333906552.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///64560162533.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/14909614696.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/10200557824.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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 10732 bytes
SHA-256: e5807ca42355ac9c742c2905d11a97cb5d77b105a4c8fc73e2ea5c8d9a26c307
font_02_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 14764 bytes
SHA-256: b198cd8e7f68321519311b0905c023b064a6b74d93d665d0beb458b3aca99131

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