Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff617e5d9a69be6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 22:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdd9e1bbae3aa2950d193284022db43d SHA-1: f2bbcb0e909e24fa4741cbb5bd78afde4c6b4869 SHA-256: fff617e5d9a69be634ec3f2c7b7eb3b5bd5dc12d56bea1109b614d92e53f2353
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a QR code lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=galaxy+wearable+app+download PDF link annotation
    • https://adproissy.emailingmanager.com/uploads/editor/file/83707091814.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090720594068.pdfIn PDF document text
    • https://senfina.top/uploads/files/82725734018.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/xawivemugomanematis.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/38825918219.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/7204273241.pdfIn PDF document text
    • http://tai-group.com/upload/files/77660404945.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/toxolizegodali.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/83266351245.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/wozixa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e654ed6f64---xozemezogupita.pdfIn PDF document text
    • http://meskerjager.nl/media/files/razenosatifenijek.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/97513916706.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348d631ff67---24117767667.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pgp0m1rmd0c5b62lftl6io48lr/lifikidupulapazeg.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/2436086559.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/vejukakizebozi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fiketu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414622f0653---56301174506.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/labosegefisad.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/vabuxo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/ketalukovesowaj.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/tevurugisebufenidenux.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/pewawapinimekajegomak.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fukomipudadaxeji.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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 17980 bytes
SHA-256: 05c7c0b6f869d05d62e9c433194c7ee2222ca8f41bea349cf7f43e1da4eae5e1
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 10508 bytes
SHA-256: baa864af832c80bc42fb7317a6192ab18d4ac709ce1e33577d23c51a3bf90ddf

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