Malicious PDF — malware analysis report

Static analysis result for SHA-256 278a6efea6ddcd71…

MALICIOUS

PDF

70.5 KB Created: 2021-06-24 22:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a77ef6e03ca79393f66e0765c9ecc89 SHA-1: b0b4ff0b0ecb424045538bbca2627ac1aaabbdf6 SHA-256: 278a6efea6ddcd71b468221ae25862095e8d907c5eae7a8259e49e15adbc6ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7bhgeaomespkt35d5h8c00ftg6/33933144418.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2c398aaccd294a49a1e2278a9a98c275/22048418318.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd62726a8---40897893280.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/soxiderekenizax.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d5b6bbe349fb496f59cdf94a4805c147/tesoxifosup.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ec18e846---31173667502.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e504c6ec3---76962853151.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/bunuxalepapizalotewexuv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3691d84bb319e914fdf9a7b50dc255da/59217564787.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jpnm63li0bqt4khqb1usjhcmqr/39354330182.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/57427508279.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/safuropexuravezuxuze.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7635858c---xarodivupowenabubudires.pdfIn PDF document text
    • http://terminsk.by/pics/files/belesasenavasepe.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/pipanowuvitawilik.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86c615a0b---leniwopitugisomupisawerev.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4pa06logp0huf8ikjq0ap9s5co/rapexafoferilanosilumizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+little+pony+season+1+full+episodesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 4980 bytes
SHA-256: 164c8270c7e56e63a0e06f7912bde352e1f59aaceeee7c2ded8ae2f2d03e2a3f
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 18132 bytes
SHA-256: 68175a2cb53fddb4a98bc83a3144c16ddf04b1f5b232f468e34a357476d6587b
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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