Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5f8ea03e4bf7e7…

MALICIOUS

PDF

77.5 KB Created: 2021-07-03 02:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ff28fe5fe31ed7fc3ec2bbbebbed975 SHA-1: 82d773eed219af4bb0ccf19e607f917bdd9a5293 SHA-256: 6a5f8ea03e4bf7e752aa93df1e895c581cb19dc1d1d5a9a26f2ca8eeac2b7118
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload storage and disposable hosting sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://philabc.ru/uplcv?utm_term=loan+request+letter+to+bank+manager+in+tamil PDF link annotation
    • https://remoteyourstaff.com/calisma2/files/uploads/padowitodezapuridoti.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/savolewaw.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/fabotedupiforedelebem.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a548d312d57---8889760304.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/71963917991.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/be47fd593ae978364dd6a237ecc02c8a/16470852021.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3287ceb3d4de167972e89dfccf46276a/dopasemoxolipepowedus.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adde34e94d5---wumasokadaloxagesusovi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/16669230235.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/27422829846.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/11017933186.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ag9eqiva04ekj1mt79v58gc4m7/94944958636.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xojakuzoroziraxinadena.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/68943026393.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6d3e70daa1128ccd1596f47d3f46040c/manoxiwegunopuloro.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7ec6ba4---zufivikazeveluwimagameb.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8d814eae581ce5231b3ced3984bb082/wesiw.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c0247b126---gajiz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3266b7285---rogajolilurizexeweva.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19ad59dc4---37055049021.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/89366829107.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/lomurax.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/82666556653.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/guzubexalatawibapadakig.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/zosezitiwapoxusamewarug.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_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 10888 bytes
SHA-256: 3f6a41cf0a5dcf3c527e251c59b2848a5b7998797bec88c94bd9c06b1d24d99d
font_02_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 16180 bytes
SHA-256: 0ee867b831b6c7a98f58b682d5ea9d9af66b555dc34d986b5ba4af8227ea245c

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