Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b9292114950e3c…

MALICIOUS

PDF

92.2 KB Created: 2021-09-14 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8845b571bdc2366c34d0f8dd96d4ef18 SHA-1: 843ae7a2fcb4c0cc9cb57a467b0df9ad56d3038f SHA-256: 60b9292114950e3c6084aa359be992938b4a2c47f7163df64d7922f35a9ac3cc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ba3813914010f4bfd8c9f856d5082e79/poludozar.pdf In PDF document text
    • http://gachmenminhchien.com/media/ftp/file/suwafudezu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/18077523289.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/zuragosokisi.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jojolidekebelilojuka.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc390c9601---80281355806.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lujenopa.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/86225918346.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/kevovewaxasujoxijiforep.pdfIn PDF document text
    • http://jfe.hk/userfiles/vomokinokunopitegiz.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/39496359401.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tonajusod.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/79163061164.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/jabutaxoju.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/saxodokolubirojimux.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/45962260205.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613252380d96d---78338001859.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/toxigokazofajerizigapu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pobin.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/70174565710.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021931449123695.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/52159819410.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/95927839775.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/22625579738.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a8ea9fd5---11400730082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+sword+art+online+alicization+rising+steel+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 24936 bytes
SHA-256: 671855dd3b15427afc76e52c178dce3ea2cb2557ac2b30a5b84dc9fbcb8c3fc0
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 10928 bytes
SHA-256: 46f64a1a8d96f8fbfea18044f8f871beed595dcf597086d16fe2029f29c72277
font_03_sfnt_off00014122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14122 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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