Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ca57becbfad7b4…

MALICIOUS

PDF

89.8 KB Created: 2021-07-08 11:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0230e9b6e1b7f3285a58d93b15c80906 SHA-1: 419846f655fc39d00f643e505e59c420aeb971c7 SHA-256: 47ca57becbfad7b44523aff504a40a3e32b24a420c0c11e735c3696f1b74281f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'SE_CALLBACK_LURE' further suggests a callback phishing or tech-support scam pattern, where users are prompted to call a number for fake issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://paymentor.nl/uploads//file/xerobukedugib.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/113c9f12c792fc1e1a4225874eaf3b68/nebuzefupufilegusu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/86be0309bc1a9cf1cc588d0cf931c8f1/61436909667.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b70fd99193e6b48f801992bae1900fdb/47427141563.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/92498010479.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ecb807ba---45677145374.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/36328327562.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hk76a0u4imt540mmeehnh1ksi6/ruxejugi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/98735288050.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/movadepijovef.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/6070884921.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63c6ac2422a09c52dd8494517ca2264e/mofoga.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kd77kqg1djsfvn1a92790glike/buganaxiludegelewobitoni.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43a874c40---69847951162.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608170887d56d---11112909949.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb71de5dbc---jigimusot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd1d4a9ab---35110351162.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c49d46393758fce4b8e1c4aebf291232/vodenakovetaz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e93884e37---wifulovigebasomuguker.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/47472501232.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0cc9fdb4---88933414644.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080549a2ab9b---69797839241.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/63cc4bf7829a367bd6a0c54390eb8e20/woremezim.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d519c4940---54218476067.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/95910894825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biggest+living+tree+in+the+worldPDF 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_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 17976 bytes
SHA-256: a6f16f2dbfd4ca61306677a96242faae5d174fe915f10193a27e0a2593cff410
font_01_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 10572 bytes
SHA-256: aac830b75c09d089f0b6f844beadc470bf938e2285cc2f75d41f1029cfb16779
font_02_sfnt_off00014188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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