Malicious PDF — malware analysis report

Static analysis result for SHA-256 be58317384d77fbf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 20:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a343a183d254e81614962587f0123542 SHA-1: 84209d8588dfd96d79fc664d46639c2d854ad882 SHA-256: be58317384d77fbfb447bfa8bd2cf570aa8e7b6ae2d5c5f1a4af08410ea4f451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown and potentially compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cqc-material.com/app/webroot/userfiles/files/48291862397.pdf In PDF document text
    • https://nedimgame.com/calisma2/files/uploads/xunivawegumedobot.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/dekitesozalogefupezepaz.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/40280129901.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aeeb87eb---pulinizemuruni.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/3922469201.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/59604625905.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vimopowowitepa.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/26102190477.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/13459536657.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/408125166.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/148c7bb67d2fe4fcd88a1b33f770f776/66266463131.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • http://birdwatching.sk/media/file/44944941578.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaa42b56d---pezoviribapejekabijuwuviw.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/69384077564.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/6690179974.pdfIn PDF document text
    • http://meditopthailand.com/file/buxikafisegutipuxuxekonon.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xonulek.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/21603763554.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/vitinifigokuvebe.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/sorib.pdfIn PDF document text
    • http://kmsenior.org/file/files/disam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+10000+robuxPDF 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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 17592 bytes
SHA-256: 9189f04ef7db0ea429d30782eda26c8f8d76fe1eac2daaf7ce2aafd095644b6a
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 9924 bytes
SHA-256: f1a912e65c11c325d4bfa108c6b65ed88d12df3e339b33ba5527eac64fbb4bbc
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1