Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6a53f9f58b0aa8…

MALICIOUS

PDF

81.5 KB Created: 2021-08-01 07:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 167bbbbdf95334a24709996719ef461d SHA-1: 385ca90639aaa91f3e2ff3c42ee2508bcc3a7bf8 SHA-256: 1d6a53f9f58b0aa87674d629b93387efd5302f176c87c1d0382aeea8c060dfbb
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, likely intended to lure users into downloading further malicious content or engaging in phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using non-clustered link farms on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://akapacha.com/userfiles/file/makefefogomudejafunevejed.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da43baa5fb6---tamosakegegafulonilul.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/53594081569.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/47865613885.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de3334f400c---nujixelavezutani.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607755d312a79---4508513483.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a752f3ba5bc---basubitawotufubiwivesot.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/91545552281.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad24c7a7---jogegelip.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0f1859adbd5d5e7d2e1a865e9760a484/4138380085.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/wivapowiw.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160868eb548326---28378508354.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dcb70585a33---mejofidavatow.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/xoxukusibe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160920cad0c0a3---bekomopokumedodi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/sanixuxisifugan.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0aefa56fc55c5736f2190ce93f7b74b4/konugomag.pdfIn PDF document text
    • http://clingac.es/d/files/42509597520.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/50175888711.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/powaguxiriruf.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a7a4b260db6c441fc90093b2c4958ae5/sifopasegujawowujalum.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/nedofu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/51e22ebf9e32e982e4323b248a5d71bc/94405549826.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15659495968.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lkmi8jgau6df01ttq4kirtbcn7/69598585008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electrical+fault+finding+guidePDF 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://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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 17012 bytes
SHA-256: 59c681ff3fdc6120ca2a3fd2aaf78572b6981ac8f2a15678fb19cf004e57f518
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10444 bytes
SHA-256: 42522318ed60011ab57fb7d68d0a8edac74386b2b982eb5f3c4a907fff3ec42c