Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e315859ed52e0b6…

MALICIOUS

PDF

103.6 KB Created: 2021-08-23 10:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ad43a46b0f2ccac280f1a9b18ea5e26 SHA-1: d16134dcdc8f7a92333c3738ebc9e9d8869d44eb SHA-256: 8e315859ed52e0b665da801a18de537d7956e90b2fb84546ab2d1458c52e7d34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=how+to+answer+a+writing+prompt PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/03baafa6a9e3928ed64421c93368d337/2063125180.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/86549206121.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/manunakirazefiwajabu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/dorufubivabolive.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/wajekukubaduge.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf97e0f53---66738677457.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210821112327.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l934ard6kalager0a7e8kvrquu/52788009082.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161218bad76000---21909181329.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f71e8a70952---83192478010.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/xigawolo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gi3qqdgbt00h12gt4mqb5jr77d/97613152155.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/genemor.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fce45fe687558b0cc65214fc3aeda4e4/47622038997.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/co4qj3lo8oa1np22la86c37b7d/gibezerijelazezaj.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/3ce010bdbc13348c963b5cb2817b40c7/86064946012.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a75716a2---xeduvobodizazezikeb.pdfIn PDF document text
    • https://siroyensao.com/upload/files/19339813210.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b222b12360c---zimuremafanalipebewozetal.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/794b43c87b70c9e98377520dc367a6cb/woxofuxotowonejavavewe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160859ec87ccc6---seniwepumilivodagogoluxiv.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/fixivot.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/26292954757.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/56cc3abc62c613d1cddb494c8456399f/87195749871.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3pd3n9o81qr2ok76r2h0go8r1e/60314863925.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_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A01 17432 bytes
SHA-256: 974c012d2616a614fd3f989f79b11382c46755d2cf2a051af25f4c38d88f56f7
font_02_sfnt_off00017723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17723 10624 bytes
SHA-256: 62e145d2d2871243831c0a1fa66c6c5a2392b77af762a456961a3d7561c3144d

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