Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c3887e3c60fc8f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 07:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 177a1fa0edf6a18d824e45bc0d08b47e SHA-1: d252722abb10d95780c614edd300ee33d49bd2d2 SHA-256: 74c3887e3c60fc8f6eba8b1ae341d8bcb1acc7561bce1aa6e5742daaf9d3800d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://bahattinburyan.com/userfiles/file/20684710387.pdf In PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/nowuzap.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/josolududoworugafimomekaz.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zokafovifiwor.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/16314166135.pdfIn PDF document text
    • http://mqskin.com/luutru/files/1605668604.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb97a632e14---99079049219.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/26586271709.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074af9a40ef3---digiloxoxixewug.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/60423551950.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa90eb281---61615432138.pdfIn PDF document text
    • http://guowangcable.com/d/files/53382698952.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2163e64ac---xosarozoriluzenuwifali.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/81023782387.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rulemepi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/kifomozubowilowofature.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084e733704eb---negesivizedekarinivoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=house+cleaning+proposal+template+pdfPDF 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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 17592 bytes
SHA-256: 52595e4274ce5cedb5c08cbdbcd1dec143e0da082d2f865a5d0696e94c0a4b67
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11052 bytes
SHA-256: 842e9aa8c0f9f65c74520b4c7c3da8038b44dea0caf198ea8c6f19c8f440bd1b
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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