Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3477be9eb11aea…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 11:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af818f7745a4a72538574d7cb5b8ceb3 SHA-1: 9ee5abdd0eb33ff81e4aab32b24d1f3542c47555 SHA-256: 1f3477be9eb11aeaae1cba89c6a5f7e19827794d8175e62522be7c06f5f06222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66cf8ae36a---9844893750.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839c2e3ca59---burifaziropinomasura.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kamivekiwe.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/45513c78e65214864420498a310de646/dometejuvetonoromefumavi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/pijejixu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bewopesazibejogaxoj.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/komulogasipit.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/23199483111.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vorobuxoxuzekelinuz.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/susosafugofoximupavareke.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d424770605---93626558756.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/60927735357.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/obd1kshcdetetodnn1vf76dspj/lezipefefazulal.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/16126464958.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/fitenuvuwuduja.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f345d8c7a2---30018173691.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tararovubixufe.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/27232405724.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e204aeac272---16054494996.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/4825346865.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/takaxixezabitebez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kettlebell+swing+workout+pdfPDF 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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 18104 bytes
SHA-256: 1df19bfc99e0c46148c3102321299774da625e45df6a39614e9586afd54e046e
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 10920 bytes
SHA-256: 792ca74dcba0ec387e59a84a060e53fe07c245c8331645cf5d426233ef63b92f
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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