Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf107baf293834c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-24 09:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d5729957483674b8d876f7ba47170f90 SHA-1: 42ebb4d8e9a3461cbd729e69e9fb88b8e6d5f275 SHA-256: 4bf107baf293834c768fc54af95a8887ef8cceefe34caeace86f35651c5c1272
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external PDFs hosted on compromised WordPress sites, suggesting a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://veterinarioassociatopacinidallatorre.eu/userfiles/files/4005147842.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5c0d0a743a5b44fca418fe24d7856666/56793626381.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tosgr67g65dmkb68vvu4ra9as4/rinalo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/91111003976.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/kekafejalakefudazo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15ef32d8e---11148847856.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mujadekekuxivebibuli.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/lapojumilijefaxuzojuxatar.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a10e6782548363908acc5e2bc56ec4aa/60882384637.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/73135890451.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/55090198018.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/39150469460.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iia5g32va25qqem97mu7i40uci/9909659508.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/67950333073.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b89ce20505d3ab3eb13863689eea9898/64379261486.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210620_075400.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/72292027764.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c94ae12b---22674809872.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ql7422trbaebk56fjauekse366/zasuv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c672437608---jemeni.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8c4334c9178111c50735586c86753718/juzexeserabupizitimosel.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zirujepera.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wudirazajesa.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/81590571670.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a0b5341cd2a0e497e989465742bf91cb/sesetitoterevodinudifedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=verbos+para+objetivos+taxonomia+de+bloom+pdfPDF 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_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 11068 bytes
SHA-256: 1fbb5fdaf1687d981e3efca319ce5dae15edb0bcf9bbc76011cb17fbd7df5be1
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 19596 bytes
SHA-256: 3f2f1c9123e92809ad37e0866b3b7edd51a5aec2e63ea916c382695e3bccc0e6

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