Malicious PDF — malware analysis report

Static analysis result for SHA-256 323bc1efd898c9e9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 06:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e6c9f12947bedab53c5cebc2544734a SHA-1: c7d5f7da4c257ba7552fc4d826645b4be5786914 SHA-256: 323bc1efd898c9e9377da56db5fb72c746d9699071e7ee1cec67417dd33fd6c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. The presence of numerous embedded URLs, many pointing to compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=what+is+graphic+animation PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1lg34lfl67d3t0q8caqfocm91k/67356212506.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0475cb4e996b94e27b9325f1abe29603/xomimevu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38e231a1037484ddda2336b45e995007/64323759473.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/bc1bd5524e9a6856317689aee128267f/88644546285.pdfIn PDF document text
    • http://saktigroup.in/uploads/xeserimigupod.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/45179471593.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb38e4da0e---20861704495.pdfIn PDF document text
    • https://arerp.kr/data/file///86381244490.pdfIn PDF document text
    • https://domilot.com/uploader/files/25367823983.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/fosuvadejegowujeme.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dc8evq97s3tav54iiget1lm1u1/nogalenofapotavin.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/97754983476.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/64844079295.pdfIn PDF document text
    • http://oris-am.com/editor_up/bovekororonalozokagilufa.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/viwoza.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/74084654052.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4e67d85eb1004d086bd6219f2a3c17a2/15140930306.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/99e72048143d1c051b43de6e61c97701/3606590231.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/56565939001.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/30462786018.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17e9ddcce---zuwafikizurutuneboporegi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4f994fa5---2727318133.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/24867925852.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/ginin.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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 15572 bytes
SHA-256: 69bc562e90d6eee3160c8e27cfcb016d3975aa372c4ce82c1e93c7d65fef4682
font_02_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10636 bytes
SHA-256: 4c92ae82a8e79d13fffe9dfc65bcf65c3a66ff83ffe5467af0cd672f14731fba

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