Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f660e0d61294f…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 07:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 93b741f418624143edab352c812af862 SHA-1: 0424dee36a19b5480d9f8f62b818b0d8480a03e3 SHA-256: b70f660e0d61294f691b1aa0a467c8f4351bd8ce8f74ede8a9737ce9162a8e9e
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • 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) or Microsoft license-boilerplate 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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/41750898548e28bf9ce1656bd75ee428/45172456835.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/lewerize.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607692460c139---91307716436.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eo1gffvk1176uqme7sgsltdqu3/36861535496.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mifukuzejiriboxazez.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770eba7dc59---18759695366.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608364041a2ae---71819280969.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nalixilugopo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6ruvmig3bgaudshbq2oa79mtfh/sisalexidegelug.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/57325310469.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210604_004610.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e839dd8cb9---gebulituburagemum.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/gutuz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95aa5598c---zugodare.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b0982e28---sevovozekaki.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lij8paj9kjihl141lmnuomp1c0/75630961135.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fd4af6b4---bolodagusumaloke.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/56766955700.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da827d654---maxaxid.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021627023296979.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ef59edb5f0589fa0117a022378e6ab62/dorune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spare+my+timePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000159c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x159C6 17324 bytes
SHA-256: 2c4ccdd136a882e131c98f7ff0b37920918a2a76f8faf8183c33329b4c33c40d
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 21136 bytes
SHA-256: b101373c88fa415825220f3976a8f7552d31a8f68490c6c61677ff54043bdb1c
font_01_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 10164 bytes
SHA-256: f01c8904c2589848ff6bad237e8f3676aabd3e51bbfdeb0841063c7927c36b95
font_03_sfnt_off00014ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF3 2532 bytes
SHA-256: 965200c68adb96220d948846ae5b0dbb9b3233e1a508cd16fa3036c982cfbca1

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