Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e2f89e37bf732…

MALICIOUS

PDF

112.8 KB Created: 2021-06-25 19:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd4c8ae1a72ce220659a4ef2f16d5e8e SHA-1: f80f617b3708bf018e3a2870cbe62c6b80e4b016 SHA-256: 9b1e2f89e37bf732a369b4232f96764fe7eeabd88de620c71455261744d5fe28
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 it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://inwebjor.ru/uplcv?utm_term=1982+50+mexican+coin+worth PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec68276e1e---kademeka.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210613_7909576C44C00CF8.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7eb338f3a3f51b545a1ce30ca2b5051c/kedobumesoxaseze.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bb71d814a20d72c1ef4c21ab4cca436c/4793389713.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd73020e9---kokosaxevatanojed.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160915de343531---xivonipokaxadinuwe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r3rp4d59o76vkhqfpb5i4nm8ig/zanigufupiku.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3ffd61b3934c4a54304d02587912a076/20939200071.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5cd72e462571ed6502ea334c6eb90483/zapobaxukixid.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/wimaludizebikawamemo.pdfIn PDF document text
    • https://birudongker.com/contents//files/tujiponamixovudawuna.pdfIn PDF document text
    • http://sukhabalka.com/files/file/mibowonunojejekoladub.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097344fcb5cb---jolil.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/25c14afea281502da3e0743e2c8a49c3/16723144942.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tirakadaruvidirofajal.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/48af53458bf143b615c26f16149b01cb/mimeweralozi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/84362999337.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6c2813873eb16dd3566aa18cd7fb3278/lujug.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ecd3ca90e---3802973195.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/34022021547.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/zupome.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5a9e3cc962331af144493d3f70cf3a82/97013143257.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/28362918167.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463a101207---wubofeda.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/51270184231.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2e1d0cfa03a0a292793b914062e08ca0/28690692183.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d516d08bb77348e5fac8e16da062dd77/pomigewurijojosowo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D1 2172 bytes
SHA-256: 97c8c3b0f307b40c6bcacc8f3b57fd00473f6713bdde61440a5e937e1bbb3ad0
font_01_sfnt_off00014f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B1 19724 bytes
SHA-256: 4e490d0c23258b3c6470af33fdb0c6a4551d58f11861a8ddf1509aef534c4aa2
font_03_sfnt_off00019ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE7 11176 bytes
SHA-256: 5edb9661ff6c41753b0aa1c034653cb8eef4d11a5c5996e9c627fc4e10753c90

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