Malicious PDF — malware analysis report

Static analysis result for SHA-256 07272ae99fa85cec…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 00:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: da8fc17ace2dc6185199e40255cadb14 SHA-1: 97a9f3a815a1f39963af5761a9ef53c682e88680 SHA-256: 07272ae99fa85cecbdcee2970ba5c58029ad68953f2f045ab09b885d035320f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs, many hosted on compromised WordPress sites or disposable domains, designed to lure users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://publicbridge.pl/userfiles/file/juzomew.pdf In PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/84623058234.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2ac4faeaa8f0fe153646e1d1a4d8c860/70078009569.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/55596781913.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c34eff03fd9---ponijubufelamisi.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/gofuriduluzawozur.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/72584890252.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/g5r1u78focs2b24ku0gqe8hp1l/81117978212.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d527539c7ed---mebuvo.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/18757490965.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e578df6c---dikadoxilupoza.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lafinuvovugev.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/3752297634.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jkmlc37lf95m72o9oh4dar0okc/desixugo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3b88983b---50050690597.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2c16c66a---nudurinemuvefexuv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bac0e7cd9451f387e4ce6164885e3f5/74509339254.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/mipazivavigipiv.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/84507473437.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cb70622e6d145817238de838ce46999b/mapufokivejatugufotidef.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mewutadinujozikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=two+syllable+words+for+first+gradePDF 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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10728 bytes
SHA-256: 6124e1c97f392517a0b2ea602de3a460483bb0e94b494a0f2452a7a1a085b904
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16428 bytes
SHA-256: 18fcb79e17c7d96eabe88e027eaad58073bcb05544c3e6bb5608ea8a69326254
font_02_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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