Malicious PDF — malware analysis report

Static analysis result for SHA-256 de583e70dac9e641…

MALICIOUS

PDF

82.5 KB Created: 2021-10-06 06:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7977d2da153b6d8fa3f4f6708bfa732 SHA-1: 5e10751a0a702f618a61197d206c6882dce6a9dc SHA-256: de583e70dac9e641bc78187ac669f4daddfc7c73ca8f112988c1e82e989df16e
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests a potential callback phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=biotechnology+%26+applied+microbiology PDF link annotation
    • http://lamay.de/userfiles/file/63232273322.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jokosofewakitatiteka.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2tvshiroii09sdopvp5vktuvh6/ribovijijetilatofuzomuwak.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/29549194981.pdfIn PDF document text
    • http://chromoink.com/updates/file/85754299965.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/381d564ff97c63743927aaaf10bd4528/natav.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xikidubulegodogipaw.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/94442876544.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f708a03671---golanoxovuxiremi.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/dopogajinepejojoxotuwax.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/44234662548.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/roregipitobifat.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gawumumabubudofafoneb.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/2411863201.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/gudipumu.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/nefukumozo.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/79056317012.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/66905457369.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210906163755630.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/femoxifujebor.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/96fe08ba59fad4a733ffcbf7efe403dc/rikij.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615944061d9d1---nerifimun.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/43663876368.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10240 bytes
SHA-256: 65a76fe64c0949a1ee27e402e3a8e66b5945f8f8bb300e0d53bb846dbda92c24
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 19600 bytes
SHA-256: 242f493a3b9aab3a3df1e0d8feff87a7c6860f0ae3e6f09970b32833b6b48834

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