Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d5cb77d5e75064…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 20:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab85c56d2f9d22735ab3c5dbbf70bcc8 SHA-1: cbfee202c9da981114446acdc48ff2b3aa708acd SHA-256: 92d5cb77d5e75064f277fb1228082a6c2ff95204fefd0e8f99ea5d17ef725b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=3m+protecta+harness+manual PDF link annotation
    • http://britishcytology.org.uk/ckfinder/userfiles/files/78273528390.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b322fe51b7f4828bbac7bb895c1129cf/xusategivufagor.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/68612216166.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6ecc912ad640f294f6d76821e6edf786/95397161036.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/35859699559.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/nisolezefexobatobivi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a4553690503bebb1c66af6e3490debc5/lepavupifa.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/45537220368.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123d61e12385---99093872912.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/23658550174.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098238370cf7---64005978494.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096d4ebfb84---jotozurisikamimereru.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kuwexurilujotetalubufix.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/gelato.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/27592030341.pdfIn PDF document text
    • http://swhos.com/upload/files/xuregurabifedaxumupiwu.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/semodosokip.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/wataji.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/gelonurutijusumevozula.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/287eb61t0q2r0lj35mg1d59t6d/66041281340.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de5c81e00---piwifidodovimabofol.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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 10724 bytes
SHA-256: b9b637186cbf006354866304bb2677d1936e91840c2e1b6bfd6c4db15101a519
font_01_sfnt_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 16768 bytes
SHA-256: 6659be08de450c7f0cdb3c9fbffb12e60496319cb51edba0afb38470e1328cd2
font_02_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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