Malicious PDF — malware analysis report

Static analysis result for SHA-256 618d1e05e3335450…

MALICIOUS

PDF

86.2 KB Created: 2021-07-17 05:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e7881c804605ce3b3318a69417ea909 SHA-1: c9dbe7aa878d3996bb566d69c12618e0336ec6d5 SHA-256: 618d1e05e3335450bd65e1d7bdb60803af7420ef6c4f276be8ed2535809d020f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. 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 0.9964

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://pastoret.it/userfiles/files/negatolagomuguxewavanus.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bf268f54---84223119699.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/62947806318.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k3quqf08psbm4hss3mi5v09eh3/rabav.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f1e01c22---99043970707.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hoh25gjbp73h6bmslcb3eh1bif/23551899467.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/u1kpllmfs7tkf86ghmsube65q2/xizijotom.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/10751953656.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/fakukesami.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/jirafupuzovetakiv.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/42124685862.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052215242920.pdfIn PDF document text
    • http://superpart.com/files/31780083377.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nefuwuwulebilari.pdfIn PDF document text
    • http://allycatering.com/userfiles/monuviza.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/897qngdmoo938mrsdhu2u1mrpc/numifumogipujegitumiviju.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/79750133691.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c2cbb2da29636dda65607a03627e95f3/2625597073.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0c5d7213d171a3edd81210cc6e0dff80/moxudubitugosemikemin.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/topewopexiri.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeac825687---wabuvepaxilagimejirejok.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632c88a35a---29701421347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pulled+muscle+near+groinPDF 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10716 bytes
SHA-256: d1e1c3dee333ac9ca24fc7dd4848f1a5bce86a9111a5b5ab2d72b53b424490e5
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16836 bytes
SHA-256: d51ed67146580d399fe011dc7d491290366917a0415068766dc911524e54b580
font_02_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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