Malicious PDF — malware analysis report

Static analysis result for SHA-256 182870dca6b75ed9…

MALICIOUS

PDF

96.3 KB Created: 2021-06-30 01:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ea9736c19a67a9fd9b2fb2ff354573b SHA-1: 21b4ee232ff182f5a419d5d95d11739af39da285 SHA-256: 182870dca6b75ed9bd9bf4f05ce2e227c4961fef53e1f601132c40799d66c4ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://oniceh.ru/uplcv?utm_term=how+to+craft+chainmail+armor+1.16 PDF link annotation
    • https://inncredel.com/uploads/wopefenazejobilugabezipi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0g3l9puh6deqt91jdu1jiocq5d/xekevibekikudowenizoli.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/dagefuxuketagibaki.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/mewumotanivosatuba.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kodifusibarifova.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e897c816a---kekadogizuguwefebino.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/15d940fc7b866ee19a54e7cf4ec90111/3696660148.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea7e4cd3---gitoradodopa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/90elu217r7dhtase000eng20bo/45449594988.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/28301284242.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/namesaninetama.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/roxupujak.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2084964295.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98c273840---56614909842.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/biwowulimow.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/jikesozig.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m3djt8jupm7h7l0vps0rufn225/4301397111.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/5313770107.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726d4870ed5---xofutekakipilatupesoki.pdfIn PDF document text
    • https://ptogel2.com/contents//files/7497321119.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c6af396dc2b539992ae01f93eb8c6f5a/66055625203.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/42126307141.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e610f91dddef770d4d831de817560c75/rititu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d67414a0ee---lusokuwikimofefatixeve.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 6864 bytes
SHA-256: 42f43cc49493619bf336eedcb65ea591e64f2f02c824784693e0c9533af6983e
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10664 bytes
SHA-256: 75b2abbe1863265189c02901569be896c04e99c7fd833a821725e3e56bcf53b0
font_03_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 27024 bytes
SHA-256: 866c633654810fa53999b1f51e950ef3a0e2c0aef28cc65240041e656d0bf276