Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae44bbd0248b18d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 00:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 429f90ee32e33c91618e7fba0ff4e22b SHA-1: 618b2ac732889257f9e3b4b556af201938f7a42b SHA-256: aae44bbd0248b18d7403a56c05054563c2fdbbe45084a64a64c8ebdefa935650
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised CMS uploads, suggesting a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. While no scripts were directly extracted, the presence of PDF-specific heuristics and numerous embedded URLs suggests an attempt to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5164

Heuristics 6

  • 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) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://prefinancovaniehypoteky.sk/res/file/rukugexatewigewutalelejit.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c526ead9bd0---budemud.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d8dfa63---12614043195.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sekafo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jewimelivorumokikinev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bd4dd64a35317fc37809106965d5e4a1/86694211638.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2dcf6fcd9395537542ffe6267513a4d4/jenamonunurudatejeko.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/tivadimenakosilot.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/15299295149.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/rokirevepijeze.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/69892524908.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/20157161968.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4385a6410---dabaweluwusinapu.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/68291767239.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-29/210729144241438680vrov04k5s8gz.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jisimebibinivetedibifom.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd9f27c85---57925611913.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210525085028.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8be2041789285e6c41aaacf3b3592006/riwado.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9cddc69bd14cb532e562acb10309d2ad/nusosibibolaz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/27uf5rc29qsipt8ebb4bem4c76/kowodalujogewusomotelefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+transmission+remote+starterPDF link annotation
    • 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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 17768 bytes
SHA-256: f4e3c99c09356aeecaa6837eebc030c720051f2603747945c74d735b1a4c82eb
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 10364 bytes
SHA-256: 93cae5f1b9f438b78b5e7dbdb9f33496707077a02d6f0d38e81b42d165c51c17

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