Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40400b484c77e36…

MALICIOUS

PDF

81.1 KB Created: 2021-07-04 12:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe4dd0850ed8298786b5e3e30884ede6 SHA-1: ba8bcc9b452fc5e92977a0b8c8271ff9362442bc SHA-256: d40400b484c77e36834960e45985c30037396bb9a7477c3c515817d23ebee5ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://huntic.ru/uplcv?utm_term=fll+to+bdl PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rgg9cdsu4epk0n4lnf2t5k31oh/rafamomariwujisig.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/62709474233.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/91785675117.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/6223742957.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609065805fd82---40662589984.pdfIn PDF document text
    • http://policylic.com/uploads/files/lofumumemolija.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/81273819386.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/aes15m2r9739jvi1m2l68fhh23/43623538249.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874bae6bb5a---mokivosavexizotuline.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cbc4819a47e840b933f8abd4f09712e0/fofudoxoj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/flr77kl26jgc83qpchkd79kmg4/lapunetedudasujekesuti.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78b8f89a64e01468c8d23c58d8b19e59/tifijogi.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sadegivuvakukopunukaluban.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/murerenolefakigevixabafe.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e04860482008823fa3604853ff648ef8/59483379344.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/joruxubetotevuxeninojog.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c372192a023---bijaledapolote.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/guludikimulazizoruda.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zizunomatesik.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b858175f8c3---57805687373.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/f8j2a4d9pc9gupamof57dmgvg2/58613741027.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/88695809491.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76780342768.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gebotivinawumurikukiduxer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 9600 bytes
SHA-256: 1fe04b21b9205a208d09ccfd756660ccc004bcd3900d98f9ebc7e948aceddca3
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_03_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 16296 bytes
SHA-256: 0b1677d8c4c734e8788ac30219e0efb50c374530594fff3cca719db2c14f4e86

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