Malicious PDF — malware analysis report

Static analysis result for SHA-256 b488073702c31374…

MALICIOUS

PDF

82.2 KB Created: 2021-08-15 12:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4181428b18301e29063b2c147ec1116c SHA-1: 19a3eeaa2f434083e40c94a1e20aa267a6513b88 SHA-256: b488073702c3137490d8a4eac737e3e5c5f406056963cc6b215c346e3d32b685
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=five+nights+at+freddy%27s+2+download+free+android PDF link annotation
    • http://119pump.net/d/files/razagaragenikejegiba.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/magaxelulagojuz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/71090483727.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/66875522248.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/58382669151.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c141b49ad---29617053923.pdfIn PDF document text
    • http://huntland.hu/upload/file/goleb.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kulifotukemudezosetofekog.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc47a5bc943---13751298841.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/22437970425.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b2f632b9a---dodikidemusumawumululel.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/56930162064.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/96926470387.pdfIn PDF document text
    • http://yejida.com/userfiles/file/46321141132.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/02ca51ed803c604212ff2cd06ea53b85/felevegezixegabor.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/99762229848.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/51882873340.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/bipufovukarakogasijupe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ec1c063460dd719af402ebd26a32b/kabesirufegokakokotexo.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/74013659999.pdfIn PDF document text
    • http://herve-coiffure.ci/files/kadiraxotifupizigopexiji.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0d85c91159d4ae7a154ba2bbe4f3e123/35354518188.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/63452780005.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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 18784 bytes
SHA-256: 665e6091853853dd58faace49e021fcb2768f14baaceee4ae2e56616ef96eebe
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 11028 bytes
SHA-256: 950fbb6f89f3025ef3f9aabbe76fca09326cbe9e2e9367fcf62f3e3ece8d37b0
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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