Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacd070c5b028bc8…

MALICIOUS

PDF

92.9 KB Created: 2021-07-16 17:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 626599bca6135b7d63c8fae020deb0b1 SHA-1: cf35d17cfa8c71c4e7d86d4712e0414b340e27c7 SHA-256: aacd070c5b028bc83155cba70d834c33e2b1cad233cdf79c7da7673687b648d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and numerous external URIs are consistent with a malicious PDF acting as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://megat.pl/uploaded/fck_files/file/75004868328.pdf In PDF document text
    • http://bidmitt.com/img/files/file/ribizurelokefizu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ee08316c---81402268801.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/55355095393.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zagezomarutasi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bdb6ca0cf---lunegewapoluxelelojogiri.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/puzedixuxen.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/1009976759.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/848204977.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/29160249373.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/besipazabenot.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7511aee5e852577347d0a870760378c7/zotuxalineturo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6c95da0---53241269319.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/favebupu.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075649bc5997---32867080749.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/netekumabosozoruvira.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/76055629878.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ea5572c3---31029756818.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d909fe35f0e2ef478eeeb863e294ed72/78148586409.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2a10d1c87391d50cb9584a522c59dbbb/gikuriwukadunegejo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jokipimamixaxonarulizij.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8fbf2f6725caff1174f3e97c0be1ecdb/sevupatetol.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088eaf03aadc---6619632643.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/kuzumafugejapepawilewufej.pdfIn PDF document text
    • http://yuhongzg.com/d/files/10658883912.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097989581d78---sezitogoladuwepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=4+pics+1+word+level+593+answerPDF 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_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 18356 bytes
SHA-256: 55111322363fcb87cc01f14bb5210453a9234fafe3b8a5680cce2a0d3e77d299
font_02_sfnt_off00014c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C51 11068 bytes
SHA-256: c5b80b6d28870d20340650274c73ad927ae6c5bbed4f4ffe989d56622c69e05f

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