Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d60438f4e54f897…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 04:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16ec3ee7d550a288ac1ee2bd546a7f68 SHA-1: 8f9299e1f7a160c3e9277e0a7801f6ceea5d5ff4 SHA-256: 1d60438f4e54f897a04f1538231c90637a3849078a4508e2d5d01f69f7af02dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious or untrustworthy destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://packagingandfoodmachinary.com/userfiles/file/doranulirogebasojirorod.pdf In PDF document text
    • http://1utilaje.ro/mm/file/xejikoboxopojudijodasis.pdfIn PDF document text
    • http://fitviewer.info/files/file/38834592067.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i4sorrnp5ufe5en9lmd43mtbad/6787254323.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e680d6d4e---gegupifubizofaduso.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/77533960487.pdfIn PDF document text
    • http://fitviewer.de/files/file/84747741531.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1bbb711298a12c50acaec6a565bc807c/larinadulotiburarenofewod.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50d677ab0---binupateloso.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/697651fad9ddebaab8679c4283091d9b/kesewanodudebewonasewejef.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10b812fc1---52484045202.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b504e63d1671e3928c648fb4ea37644e/85355511845.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1356a355---kinesaxufep.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/96c191f0bed2fd927facbb6eb5f076f0/29270838982.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210518201101.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/62266288100.pdfIn PDF document text
    • http://chromavials.com/d/files/jusezokis.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/67553609332.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/82453211838.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c2f73d37ff61e7838cdf7ed9759155d/64893503912.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rubitusikepanuzilujotuwif.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20159e98941d8ac788ac64a0153e11a3/33961224417.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/36126629014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=masif+splenomegali+nedenleri+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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10736 bytes
SHA-256: 1b4bd7e4f9c8c30946b020b1d9d0279cedefbf996e72dc2028069b4dea22f688
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 18664 bytes
SHA-256: 58453263793a284beebb69073b51e3f71f6b7010a794df302ae5f96a6d64009b

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