Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa52408d5c4cc726…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 09:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0c129661f29d331be9b08ef66489cf9 SHA-1: 057cb19c53c36db08615a93e8a3f3c720b35e659 SHA-256: aa52408d5c4cc726247a870468e104a5c102e3c2da5f392fa686c9c273112686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, disguised as a lure for game downloads. The presence of a link farm suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chief-moving.com/editor_upload/file/71445721946.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/54412729886.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f94f999a0cc33ca9c1f945a34fb574c8/76740913115.pdfIn PDF document text
    • http://land89.com/ckupload/files/xumomevolej.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/pepotizizaf.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0858172e0---nomipitetigafejolopimor.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14327943580.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/61454053336.pdfIn PDF document text
    • http://esistore.be/userfiles/file/gewede.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16294652682.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed63a776d---29133240193.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/22782478494.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73947863787.pdfIn PDF document text
    • http://rooptex.com/uploads/lumevosobirawasataw.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/99777249205.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/kegudenatigagidexujur.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/rulugawo.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/bavimabuj.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0ff46d54e1e31012e7f8721f6f7a482c/3359062408.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/rilotazokejadofirakoxirex.pdfIn PDF document text
    • https://gencatakan.com/upload/file/65682704171.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/35522096692.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/57167508117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=winning+eleven+2019+apkPDF 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_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 19300 bytes
SHA-256: a5324f1057f5d810b52d023bd5440f85d9d7a19781a32bc91a01e7e26ca395a9
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10556 bytes
SHA-256: f753ada4f14b44836ca4f6ff3a840974210731305a0e7d4e9767167f3d34941d