Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e513ba7817b6d0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 09:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56ad6716a71cfb216150251720b79229 SHA-1: 890abc9b932233e81d12f71dd9b2d4e2d8b341f2 SHA-256: a2e513ba7817b6d0a8535d5244059cb4e2e3c0b8bf867dad655c0fac44b4cd99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=engg+chemistry+book+pdf PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/79216953632.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/79602479090.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/78288697880.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f2e68dba---silanipuxewezugaxa.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/livareka.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/vawamofopez.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/gozasopalesidusiram.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kogoxegol.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b4da532---papuvitifilufigolif.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/najuzejolotiga.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3770b688---falusuzemor.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/fibufanumakojupejeje.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd841a4c15---98982142456.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/derunexobitukema.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bakuzubobuwadunewa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c91da5640---67151453334.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/56124597320.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/33916850668.pdfIn PDF document text
    • http://entrackintl.com/uploads/laxinurebibawodovupe.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/73636532915.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/89690697369.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613070ea83f1e---mudazasanowozevovagofeg.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/40930886450.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/34000909488.pdfIn PDF document text
    • 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_off0000c1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 17068 bytes
SHA-256: ab1e9a5125b4189487e9b543d615b7faba7ec7d89d742f6aa46409e73c466205
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 11188 bytes
SHA-256: cb8f13756de3dc8e13bcc0f85208ee1b08837eed03e816e579729dce92812e57
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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