Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaaee14a5b73644…

MALICIOUS

PDF

88.3 KB Created: 2021-07-10 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad8fe8baf5aa853f8b6cb3c4602c8ba9 SHA-1: 45faeb09a1f1dc736c5e8dadc8459f63c2b000a3 SHA-256: cdaaee14a5b73644a48003c43907310232a98d0e98cb27fd803aa0134fccf975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2dce06b0ac56dbffa8953d5e4ee1c815/55391374792.pdf In PDF document text
    • http://altinay-law.com/images/file/39357366718.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/jimuberibajonerosi.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/17097179549.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/6722226819.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/melotatu.pdfIn PDF document text
    • https://businesslife.com/content/file/papujum.pdfIn PDF document text
    • https://ivanamihic.com//files/33284690841.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jnc10h0n39u7ikhqef588k4qlr/73114932216.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rulawokopozemagisojixa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kapoliderumibaga.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aee5b30dfd8---8838595816.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607949765cb49---68005507491.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1dak8dnbq5k98n0ee5530mo1m6/jusel.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/90605246468.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f20bc1d5---76115930789.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at4jp7jqsq92etbp1b4dh6rcl6/36399118606.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fc73d982---fodepuwizoto.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/1985618727.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/suwuxijurosaxaj.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/40dfe581bea37da811dd09af8d4d3476/puxeleteselafavuv.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ce7193dd4c75df902b9b3c2c2df2fd58/begeromivofebatererubeser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ets+2+bus+game+download+androidPDF 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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17952 bytes
SHA-256: fdc35e6f524a9ea7790a8942b760c4abafbf1429d2ded9afacbd2edaa512d32e
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 11020 bytes
SHA-256: ba05417a1b486aea2b4b12012f1031c5ed85b4bc7e2097b5880ca501cb895e84

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