Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56d7cdfe8a345ee…

MALICIOUS

PDF

88.6 KB Created: 2021-07-27 03:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39903dbdc9acab91e3c5abfef775a3f9 SHA-1: e28f46c1c767f44513c6a212f3007e91d734d010 SHA-256: b56d7cdfe8a345eefa4fcfae773521ecbe9890a3d629568bbe0fa4cb685337af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with numerous embedded URLs pointing to compromised WordPress installations and disposable hosting. These links likely serve as lures to phishing or malware distribution sites, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abed515108a---genutezapudaduzoferupiliz.pdf In PDF document text
    • http://auto-spec.ca/fck/file/rutetug.pdfIn PDF document text
    • http://farmina.ru/uploads/files/40363646851.pdfIn PDF document text
    • http://wenxuezj.com/images/File/48107269342.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f476a3b5---16228976339.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5qmtgnp4a8bdq74mv0r20dij68/74751676643.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/n04sdtu29oiemvqle6cci5gj31/mukilunijo.pdfIn PDF document text
    • http://clarasonic.com/upload/file/98122037788.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/sofefidikipizekabunobakev.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210612150024.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715110a7ff8---kexogudigilavam.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/60820107726.pdfIn PDF document text
    • http://ge-mak.com/files/zajatuk.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///68932712414.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lojatij.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/12456364055.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/tasositomugesusexidule.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/tumakatetunub.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a28390b9b26543b1581267d431cf415d/3102007026.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/52065151985.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f185433b02a3535c749e3b0d7a227ece/gebokiro.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f97fac46f65---simozuf.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/sinodakubugo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/bezelutijonudadenadaked.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/58001373291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+downgrade+my+dstv+packagePDF 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_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 17188 bytes
SHA-256: 415039928599312e73ff5e17130682e74e415916c8d9460a0ab7bd0fe90009e8
font_01_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 11160 bytes
SHA-256: f5cb8981cc54cfe7f293f7db5e6058eb7bf9501dd3a9c54ff73cbec15076c084
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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