Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc15b8bb677e5e7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52c91bfe7d1333055d0e5978e0def4ee SHA-1: bb588c8e4a7c49a2adf37967d8157501a4449636 SHA-256: 1dc15b8bb677e5e796b8417777fa296df296ef935a571f06cf23a9831691dffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous links to other PDFs on compromised WordPress sites. The presence of these links suggests an attempt to distribute malicious content or redirect users to phishing pages, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae8c4201---jolupuvivigipujozi.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c401f70c52e---45995038639.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217b2f8ebc2---xajepakepugijizo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/967477b611392ba4bb54f816f137e693/9890948196.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/febdde2624fca315b90b6eb18153542f/83782951724.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106061026579159.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gowobajemokudakabego.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/biboboledemijiki.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b0ec43a7---numaf.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/39285187413.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/62634347579.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gagubitovo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/69071167707.pdfIn PDF document text
    • http://rentaruedas.com/files/others/97831901606.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6b54e8f352a7f99de16ec49a96785949/71724368588.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/lotemunegetufuzamozivesiz.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/mesepiluxululurenudivuge.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/122234035ec9eb2d4696b5d7e096b8ea/15421702134.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/nesapazoganenagaxesevo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hrns31uo8s4uiicdjhroj6llgb/44650114358.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/55090837313.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/57148414721.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210807/0547513506.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/rutoxutuvikulefab.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/84058829130.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/logutupigenosike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=family+worksheet+for+first+gradePDF link annotation
    • 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10964 bytes
SHA-256: 1ee29228e24e399c192a92f1f750e117de9b80f1c7578894ac0732492c5a1324
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 17040 bytes
SHA-256: 2938a9743f93614e8caef57d3ecb9e952e5f594667a5626b855110a1c61f0b27
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.