Malicious PDF — malware analysis report

Static analysis result for SHA-256 183fe0b8d30f225c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 21:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e3f24f1bff37e53376657d45119df20 SHA-1: 38e4a66f621be05577c61cf5d149966c04661990 SHA-256: 183fe0b8d30f225c1285bbbc114ff1d3f282a4218ec99438164badacf1dc71cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of external URIs and a link farm points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=yds+phrasal+verbs+test PDF link annotation
    • https://alkathirilaw.com/userfiles/files/genarexun.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jiladorojuzumireb.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/8274871348.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bd9229f4---88610711750.pdfIn PDF document text
    • http://bankerz.in/qpic/files/vaxamowoxexe.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/pewobarilowisa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0be4c70dd06629c5fe8bbee576c801b8/63952560544.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/13887210587.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wikadowineje.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd030fcf7---62252312554.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/xositugo.pdfIn PDF document text
    • https://hobbypet.cz/files/file/wenezegikeloxelitam.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/tarolanixevelufido.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/pepiriruwu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/puxiwezov.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134002ac91ca---28872607536.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210911202424.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/73192181514.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/20090546509.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/bafijenixiverap.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/66997856.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/dejapofivuzawamarak.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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 20176 bytes
SHA-256: 92ea966d7645a94195b5d34b1e01f4a2f3b83b70662c29faa4fec1620a096982
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 10364 bytes
SHA-256: 2fc713ce7e3f367332bf8ec3750a08a1603b3d1d82371fd6a09d157da42547d0

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