Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcb3a838222965b…

MALICIOUS

PDF

78.8 KB Created: 2021-07-04 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9111cb3f5b63a74ff040eb81237d2cc8 SHA-1: 54d01ed59a8dac9577d6c0801332161958155dd4 SHA-256: dfcb3a838222965b88315b78c5162fe881acdef389a1c90931006515248ee738
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mobilieroccasion.fr/uploads/file/xolopujojavivepane.pdf In PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a31c410acfaa54c5b601e43a113cd926/vumojigodatoxofadojuva.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59b38992b---27641118776.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b956844f025---takuratuzivifepoziwos.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/10668311962.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/rosokivob.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817a813b33---74051837618.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tebibunixep.pdfIn PDF document text
    • http://cga82.com/admin/File/73230490339.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/mavoparozuxofudeniretow.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38c761bd6---jujotivorifexiwusegeg.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c329eeb477e747194ecf8fea0406277d/turatosodif.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dab484c312727fe377e7322b45e12eae/99577577689.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/mowoj.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cgu378t9h9qdfid6t9ulpt7cpj/kotekutolenotamifumiv.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/4636489620.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1b67d130---sukikowesivor.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5858d9654b2ba04d931d7ba1e49cc97c/14473548029.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1bf9940e---9716017352.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/injikkhbuss2rnubgedfia72hp/3137311516.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05870c04f---gegirixututelo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/wetoritodudelapowuzat.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/63437606050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+commutative+ring+without+unityPDF 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_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 17684 bytes
SHA-256: 8b68543b98df951d1724655a9b24ba94985a0ad3ece0c5667ca9148763c26243
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 11212 bytes
SHA-256: 2e13b3921222ff5d8c8317c836842ed4d943f33c98562e1708caae3a0cfc53a0