Malicious PDF — malware analysis report

Static analysis result for SHA-256 816a63c4260f3653…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 02:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a8e2c4000ff051ac110a848347f1170 SHA-1: b37144d61418a0fbd9b69ab9e803f9f51c9796da SHA-256: 816a63c4260f36537b5bad384bc499bbab66f13cacb693e10e3b6eea4fffb2c9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to host malicious content. The presence of urgency and invoice lures, combined with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and URL findings are consistent with a malicious PDF designed to redirect users to a compromised site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://szpk.hu/_user/file/kefaweberilawivimumuvu.pdf In PDF document text
    • https://gsacademy.ge/uploads/files/35845289157.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/86734074143.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xanoridagebixone.pdfIn PDF document text
    • http://erictex.com/ufiles/files/87341873289.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/91060055749.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee525da826---degubu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138048dd1a16---jabekananagedawuf.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/85614219049.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/takegadoresavedaxajud.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915170513519931.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/69455205460.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174e23a5d2---tadibivasaxivisiwixobaw.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54348384056.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/nigetexisamivezekidutoni.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd0eb7022---vutotepodabazuzamufu.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/5620133725.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/fixajelujavag.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/dinilawedubik.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/lepagoxerot.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kigiwajolofafosonufer.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/fepatexemosejonunajata.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/66006537973.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109100306025919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quick+book+online+sign+inPDF 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 18064 bytes
SHA-256: b14d50a95973bc7ec2d552e01c620750dc467a24a8262d467f0ee4a6afdc9202
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10436 bytes
SHA-256: 21b9e41c194b18a4e14cceaedde7191c8fbd3f83eed435662e525b2ba06c0405

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