Malicious PDF — malware analysis report

Static analysis result for SHA-256 688b898958c4fe7d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 16:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5789a1240e6341087ba1abb7e2083f3 SHA-1: f41704a91ab9345e0910716636599463b3286e7c SHA-256: 688b898958c4fe7d7a9bbbd96a39e3a722a590fa64043f762cabfd0361dcfa0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=conquest+games+android PDF link annotation
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3c3cf80fd0f90e6ff11e40313dc5e602/doxudupafikirenebobugabuz.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/36776274873.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/25469699486.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/972df4a014756b226df42f8f3ca306a1/sexenuk.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/22639187112.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/valaxolufekemogitilufo.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kexosumel.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6tlr4lchkm5d8cfs1tlm6pi9kv/65511344812.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xivaxisusipe.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xopemifowefuwukuvavitefuf.pdfIn PDF document text
    • https://kueapem.com/contents/files/10099924648.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sobimakefolibenap.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80610056985.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/rigidakinokusifob.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/rubavuzetutoxolota.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/73454780595.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/37122425437.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/najuvukumamorovagelup.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/43242656135.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jixekabufewufolozu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/xirigoxaxokigibeguxemowaw.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/fopikodivifomezafubewosix.pdfIn PDF document text
    • http://splogservice.ru/content/files/doladegiwoz.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/3142097621.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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16616 bytes
SHA-256: 7b62bc05a192025f0bfa4a5a5371095d363e45271373e38680a9d3d2aa19573c
font_01_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 10824 bytes
SHA-256: a928f35a179a95a757715328e3e57622f1d74aa1d6e9fa82d523c897c512d65e

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