Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e80cc1f4dda0abd…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 16:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6a201072c085f6ae10f67ee9ba40b8b SHA-1: 8786c84802fcd423d91b09502dc919db542b8cb9 SHA-256: 1e80cc1f4dda0abd6ab181b7141525a19dd11b92bc387efe563e6c5e5e4404af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=diet+chart+for+weight+loss+for+female+non+vegetarian PDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a48a128b---94397715482.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbb598a992f98efaf898b0acc3959b6/62668540658.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a49576ae9e4---mudedadoganilipezagon.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/petesifojedarigadom.pdfIn PDF document text
    • http://cahayaapi1.com/contents//files/93833219087.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fenolijekowekop.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3373ce5ea2e970c584bbe2106bcf1425/durozolurebifijo.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/61211859594.pdfIn PDF document text
    • https://area5srl.it/file/mufutosiwaxuki.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gewagixuwov.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/19487579050.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a407968b175---dodapopokowepepovilejew.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/59121873378.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad35e7574e8---miremiz.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/voxodidi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/piwowuxaxedibowinutuz.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7f8c052862a47906c7a27e287234402c/sumelubemuwetalatolewuf.pdfIn PDF document text
    • https://medlineplus.gov/diets.htmlIn 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_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 17032 bytes
SHA-256: a7aa1ba3737e9772f35b4cdf070279ba8c754c3008c539f81c9226f9a38fba48
font_02_sfnt_off0001430c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430C 10936 bytes
SHA-256: dd0c259fe5bd81e28178460e956d8beaa0c8f49ab63bb7c248b29563a3f9cd79