Malicious PDF — malware analysis report

Static analysis result for SHA-256 038b1657394408dd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 00:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afb72dce638a2b11e8d3ec39774fec47 SHA-1: 11bd0972f966c5f565459b908c12aafae2b492a1 SHA-256: 038b1657394408dd949854187ed7150e4bfe854b5bba1be6eac2050e613d6646
196 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 sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drumlockingclamp.com/FCK_Editor_Images/files/38890471280.pdf In PDF document text
    • http://studiomanzella.com/userfiles/files/14833397975.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/wopitamedojipi.pdfIn PDF document text
    • http://gaudi.tw/upload/files/7674544258.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/75649856700.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a330c1e024---robemuwe.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/lubuligipojafusowitok.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/gujelaxukuxikigup.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/96bfb5f717939443f9516b25523f1ccd/72350216580.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/95785543646.pdfIn PDF document text
    • https://sadex.pl/fck/file/pezaxosesawafadawoti.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm1obsutru5hbpk6lh1pj8knlm/58467170883.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/37020871643.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/84757694044.pdfIn PDF document text
    • http://vhktn.at/images/content/files/xawizubetidej.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87246397600.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wisositikunepeg.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/jozimefepepalolij.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/73638706085.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc09d0128fed473c57cdc0989835bf2e/tutawotanawawujetesilamaf.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/2962488018.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/lidulekun.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/gadejilajigotelim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=square+root+2+to+50PDF 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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 18460 bytes
SHA-256: 2bf85230915fd0e76e539d11cd543da5be289bbb4af278c7c58ecbea86bad5b8
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10388 bytes
SHA-256: 29417348e684421ab2f52e86b1a68c80681bd187337ff7dddc8faa7cfbb33001
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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