Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82cb9cfb3efb622…

MALICIOUS

PDF

78.9 KB Created: 2021-08-15 00:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b4e9eb75f481e526254dcc620b20e85c SHA-1: 58f5b6a36630cb778d30060602d8c761f89338d2 SHA-256: f82cb9cfb3efb62261fc6fff954839fd59840f764d0e0478ee1cdf4890558f5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attack pattern designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://scard.vn/app/webroot/uploads/files/bulafawojeneribowepaji.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc2c9ccb2---63459121659.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rejofajevusasefip.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r1u2at85fbtq9lc5jqnkb19nu2/77355264476.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6daac608779632b94296411e67929edb/53395580369.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vavefibubusipobodenesuvij.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/wedekota.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/nodubuviwuxezebemu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/stvvcjfch2ndj48g4an7aqqad3/zeriwokegalujo.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/93026669959.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/86636107907.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/21352250337.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/81986432967.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb82295ca7---9323716811.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081106131070554.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u6caiuirc36udukv0d5lvbauf5/mumuxurirorerufi.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/gewawavaxiviraminajazupo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a007fa03d78---rifazudubet.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/guxurepedu.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/xinerikivuziwukaxuwal.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a10e8035fd0460af698996196ce6057e/97897741992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lecture+tutorials+for+introductory+astronomy+2nd+edition+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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 11072 bytes
SHA-256: 47dbaae8bbbfd8295b3771c038d296060bbb25972bc7822d21a7889afe15b9e2
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 16816 bytes
SHA-256: 45030562e6087c7d07a1e09bbda62c0ecc353c5f4301d51a3ed616ef08411b2e

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