Malicious PDF — malware analysis report

Static analysis result for SHA-256 53749679cb67b891…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 10:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ac826a5c609ef9b0e87f4e8caa52d9a7 SHA-1: 087bf15849af5cc2c37c26e30584c8c1604ca0a3 SHA-256: 53749679cb67b891d6cceca31eefbbd92f58da75b9eb783f00eea7721a3dbc3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of a spearphishing attachment, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hn76pirub01ppgoh88j8at6vli/revenakenosi.pdf In PDF document text
    • https://minipowerpack.net/upload/files/30920732865.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mikokofi.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/47422193240.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/21621211675.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7fcb0fef---dugomadapojemej.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/79320648465.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076549e0ae33---wefozopizex.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/tonakamakak.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9345ce4616e7c23ed70eb1cf2ae8a7c8/23036262313.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/najejujepugijupepeve.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4da1da8---tokisubigi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mmshdrc27cmsl0vaehgm0g2r25/29908942999.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/909edfb82dbb5c692359708f4aa87bdc/tulasiwepida.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/cjpi9sm4qdbdm6co5sdv0kcjln/7324885894.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0bd7feaa7ca93e0f1cbe49872d395274/seduxakobawasupi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/332c025d21f242649afe70a53d493e75/pebupinadizik.pdfIn PDF document text
    • http://stasta.com/userfiles/file/wepolepukos.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/53245998766.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/garanudekuwozat.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef85a8800---gajuvobizemezubapuxabofir.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7404de58938509a79276e815d0fe6722/98937392000.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/49277386762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=answer+to+why+you+left+your+last+jobPDF 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://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_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16820 bytes
SHA-256: e1742cd965627c935ce747a34027963a84b8422c21be22120ba00b4a3d8b6940
font_01_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10772 bytes
SHA-256: 8c4fff42534e9c50f57b9d6b530368abd32fc1280a41ef46ffac59c0cb38e394
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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