Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c6f11f71d6c7d2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 00:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21675fcbcd2b416407232c364d1bd988 SHA-1: c4caada9bb78864e76b2d10ff0053e307db7c360 SHA-256: 55c6f11f71d6c7d2395fb461df5d8271719e3bcc1bfd40ec3a636e3af35ba73b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable links. Numerous external URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://c2r-auto.com/uploadfiles/file/2021070202193773499.pdf In PDF document text
    • https://bbgpiti.com/userfiles/files/pikukigefenizuwo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/75778006799.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/3661439262.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/libusibamagorodewujuni.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/nonigugowigowekonelure.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/35382634443.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/lesekuladorefaka.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/43c9fe186ff05946215558059ce2cc22/3351460254.pdfIn PDF document text
    • https://digireg.org/upload/zizilalevefaj.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/88957895000.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7f15e300---kaxowevazasuzenebot.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/j312po5eddtcq0pln8hmbbekud/38537201641.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2108a2c631---logarugunosipepinufosuzez.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81696603013.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/55482177030.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/38034020490.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfee25895---1596042010.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/domiweles.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/75258338759.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tavoberuwanumefupajepa.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/49183855956.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/ramoxoxeforeju.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96af71e8a---tenibatugededi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tapping+clicker+otomatisPDF 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_off0000b9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F3 10772 bytes
SHA-256: 9dc6af2f2dc98a8916c77658698328aede60f4aa9bab6538f7fe24c95c9e543c
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 14208 bytes
SHA-256: 25029c24efd4b5afa0f76dfa14f9c9e87002d8376d65b9a53ccc989b82543c60
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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