Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b78f0fec75a80d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 00:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f73f45b7ae3b2038e7447015fd8434eb SHA-1: c02fd508d8129a8dfe63ff5f552f69417257262e SHA-256: 54b78f0fec75a80dda69c46de654e5c292f4a047838bd2371c71d20754623217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of urgency language further supports a phishing or social engineering lure. No scripts were extracted, but the structure and link farm nature are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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
  • 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://www.perchegouet.com/ckfinder/userfiles/files/molevusenupivan.pdf In PDF document text
    • https://bodymason.com/user_uploads/files/kixikazali.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/74797861383.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903222404.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/64506410214.pdfIn PDF document text
    • https://tebra.si/userfiles/file/vofalupogadupobagukika.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613873bbd0a07---70567270493.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/62986605634.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zabigowuja.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/45147573be4dcc8e830eef99d6fa66da/pilifegimobajuxixini.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/1619843073.pdfIn PDF document text
    • http://biomehl.com/images/content/files/nisofot.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rutomuvedabigineladag.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/gelilumusa.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zufobutijez.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vurorililepujadewirigi.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kofuvedajamudoxesipawuve.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/bodanonodumizijigaxoga.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/75c97fde5f9cc9dde4528bd625cfd283/dumividaragopogasamenino.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/sezewozosaxazu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8ca1bd492e2dcdba9145d9f45b498c8c/76646124717.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/97507325049.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/96460997303.pdfIn PDF document text
    • http://dongphat.net/upload/files/fufun.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613037c7ad3eb---67557301248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=games+online+for+3+playersPDF 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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 10748 bytes
SHA-256: e1b27d7e559e4b6b75a1913c590c29173e6aedda9963337b0bef101422014fa8
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 17520 bytes
SHA-256: 4e746246cd840c827a03679a6e370795861fbc980950763bab7c572b1c13f37f

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