Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b65ade2698709…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 02:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a4b105618eee74f5ffd393a429c90c28 SHA-1: 758512347125108dfebda824df6a2882d9ddb370 SHA-256: a83b65ade269870990a0e34638a704fced8c91f4a99270c70d4aa33679bc640c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=keeping+pelargoniums+over+winter PDF link annotation
    • http://yakutiaprime.ru/SITE/files/editor/file/perosaluxudopir.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c523f77c7f4.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901a6df0fbb---83880815893.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c389b4f2e91---petuxedirawovujifeloler.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pcigb6tu2ch184k081cptlemc7/93074891157.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47385c06c---61930261262.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/talomerok.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8a268097aa070bdfab2426059c394b0a/mexotinupiluzegexo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5dd517994be9a319bfe41da6317b5d6/kizagomozirifemiked.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5724cbd07f---4826448187.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/h1sr4h1q0kmin80iqhic6pphv2/95245027922.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/72473177802.pdfIn PDF document text
    • http://recrute.fr/files/files/suzusasolifu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bsvdpr92akcvf69jpbg6r58s03/15982961912.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcfd877a6c---27329806993.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wulapurufe.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/rekufiwinugivo.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/2981716039.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4f8e3ba0aa34b5784dcc18900dc0851a/vedinovigogawolilemi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b9a0baa2---60188596825.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/59644732100.pdfIn PDF document text
    • http://asfalon.com/__files/file/84263566624.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xanezugidozo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887c2d91a4b---55183827931.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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10840 bytes
SHA-256: 8fe8da60740dd932d145b2519cb40c4dae63220455af6d01e52c2023d48e7511
font_02_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 16808 bytes
SHA-256: f94436bd44c72e35a4911842e20a3a9f3cc021884357c151d894b614c5c8e37e

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