Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a58615c4b61cf…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 21:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9da9c4a566cb8d0d7126f01c888e8b07 SHA-1: b2b511c8e797f490d304c1115ebeee9c8a37977e SHA-256: a33a58615c4b61cffb65ee5a4618bc7c74741dba6954076befee3271861e423c
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. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute further malicious content. The presence of these links and the compromised hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e474b648d6---32631143388.pdf In PDF document text
    • http://mstreatmentadvances.com/userfiles/files/fafisameje.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160f874bc635b5---tasajarame.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/46312806579.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/51219827827.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610698baf3a33---nenodixubitazumufokikeze.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/889b273e8b32e18a9ec4578a079cdc2f/napelobegomod.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/56904748030.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/do8ch90l1dbtfkehfv9o7hadmt/xowik.pdfIn PDF document text
    • http://nscenter.cn/upload/files/33218383000.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e53e557d---wenemarolugugelifune.pdfIn PDF document text
    • https://securitydm.net/slicice/file/vaxujapalowofuwuzafat.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210527182626132647cehh07.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514060048_689404889.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/28201592113.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3ab1cf701a29374dd84dacc33f1921d2/4515168254.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad712394b1c---wabulefujaxowifadum.pdfIn PDF document text
    • https://auto826.com/uploads/files/xorupirojuwefenikawe.pdfIn PDF document text
    • https://yellowstonewildlife.com/nivudolulatet.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6h998rn59hdtjt1pm8bo0l3gos/10514285293.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43107968160.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f63e9875---sizefagepube.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/385326062.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad44e8ce5---vejimix.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nexoletekirasonorolizeran.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/23833472656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=expansion+joint+in+buildings+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_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 18092 bytes
SHA-256: d9d5c6352f028224278cf650941e18b6b1384d4b14bfc75c4666e49c18c2067a
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 10896 bytes
SHA-256: 0b22ce3c6eba2b914d28ff6e287966f7948e0dea865ea7dd00e72b0537b61efb

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