Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a80cccb7a6e651…

MALICIOUS

PDF

84.2 KB Created: 2021-07-22 02:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49f985e78c503f79b5026daf57317af0 SHA-1: 877f782796564ff3aaf9b8279e489adac7b78a9f SHA-256: d1a80cccb7a6e6511edc2b8867c02eb28d1eb422ad1f8849da369f042b53afe8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e78ec1d8879---64310820675.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/95336302346.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ra8lr0pafgs5akk8ploi0tkihg/86739286918.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/rifasudovotiruxumin.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dikosimokozofa.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0126e2bb4456cba821748a76e7040cd0/kisusijebomogubuzeba.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc54314fb0---vurunodadukamoxuzosefuk.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/28681727585.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836bbc44a83---49506107271.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6681e8a6---sazufas.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc110d01bc---gowatugun.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/55ba0e94edf2c260a2bc15bc0f446704/92071553742.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/50638677725.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/63951173450.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pakip.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/203f218bf8d4c5259fe3254e1e24684b/15494518216.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/84850133432.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/91e31af4daaa4b8eddf713ff70be2164/88398813983.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/76906473874.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/59078337272.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3605208083---25817245372.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bopiwipukijijadoguxaku.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3c5e48e31974925818d4860dfbe8dbdc/lipukekutunezivo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ddea9ce053d91fc0438c24c2be878ad3/funolowifis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=acid+fast+staining+pptPDF 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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 16656 bytes
SHA-256: f75f50cd2bf2060ebcb63b8b25e3a518a79dd88c3f24b1d360fe69188b24e485
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 10376 bytes
SHA-256: 6ed8806afc9b0c828070ebdb48766a8227ccb1c6bb1e8b1b66e68ea2cafc10ff

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