Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6e5c43b7352a7…

MALICIOUS

PDF

86.4 KB Created: 2021-10-26 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: e44c2f820c9fb387cadf0362b085cbde SHA-1: a64e0a733d2242af1a64c3aa88f12ea0626d335a SHA-256: 3ad6e5c43b7352a708d953ecf895f1a3f1dbae392b52b699a20b90757fc9455c
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 websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=fifty+shades+of+grey+online+for+free PDF link annotation
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/vezojule.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/66092548031.pdfIn PDF document text
    • https://ms1oke.com/contents/files/42847493093.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/15088329240.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/56152354830.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/61420316265.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/90893892730.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/39040907569.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/jumuxudoregagibawiga.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///46594122306.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/zejuziwewoloke.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fe5d2b715a719049f319803a9378ff9e/4370177416.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/davizijulofejibekeru.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8857a43512abb4a1a71e0ac5d9ecf223/wedomupuxiz.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/bojitesud.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ggo1toe0vlgurav7ine384m2df/37663826676.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/sukezajubizuz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d7f94fdb8f3f1afb85c45ae57dc5c4d/55767524513.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/609cd0231f0b0237d4b656d0756d2dcf/nasiluwomunagabegidade.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/5402321047.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/23131098615.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210909071650.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/92248144649.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 10724 bytes
SHA-256: 75030610325ba5f6c536cce12d1cdbd68533e4d7837e03cb02b46faf10ddf6ba
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 19212 bytes
SHA-256: 763ca01aba08cdfa728fd7d404191fa2a46fd4e194bad6b9a7951c385d18b04f
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1