Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24782f4defc6940…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 23:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b60e88f2126de5d49a1ae140371da477 SHA-1: d82fd0c61beaa09a19aad9e64aa72a8351172feb SHA-256: d24782f4defc6940e9d2fa5c64ac2ca7da067e000980d943680da3202fd24b7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the presence of a link farm, with many external URIs pointing to potentially compromised CMS upload directories or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=reface+in+video PDF link annotation
    • http://klm-co.ru/foto/ck/files/fiwudedinaredowajefir.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/zisovewezolu.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/mopixavuwusa.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/wemowonax.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a0851b7fed---29699867141.pdfIn PDF document text
    • http://domilot.com/uploader/files/43580932658.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149268053871---64771931714.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/56768288430.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/golorij.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/safikinuta.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tivimilepiwavukudalixorax.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/sidutopelo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149f99b8d720---33340704806.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630627008c7e1a8315717a9cdd8fd.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/92333180692.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/68165006784.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159454cead63---mavibisunasetowigev.pdfPDF link annotation
    • https://stephankeppel.com/userfiles/file/polikedodaliluxepom.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/54280233239.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/de12e9f8cef236daaba78573249deb3a/bazudaxadizuwetavisolevuk.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/lotenizesir.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vedikom.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_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 17144 bytes
SHA-256: cf9df9051ba3d040aa713e2baea0feb6b10b95ca15729743c95553e2d461e862
font_01_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 10168 bytes
SHA-256: 4da1f95befa558116a0f3684f2164f5d623815ae15a77b5467aa5e91a5ebea47
font_02_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1