Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ef3612914a3ab8…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ea4b75834c96fd1da7cc2298dbd4649 SHA-1: badef4fed6632281b22c6df0fdb14a5c00033ede SHA-256: 14ef3612914a3ab85842899ed12dfdf1a03031eafcbea043e9b738a25b48dc8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to obscure the true destination or leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://abwalabamaave.com/uploads/files/30301439521.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/35593305821.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba3f589b5---90047603727.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/audc69lpsf4n87s9ir5dvhtrn4/12840152694.pdfIn PDF document text
    • https://etadelloro.it/images/file/waxesumenewijinixozi.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/54703ed4e0abd9c854d6755786f4c8a0/62512072579.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/dapuzunotelukuzewexoz.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/6502161284.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7752b067542a63c7675202fb7e589714/83795103772.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/866e9089c5e2405e7336b926b710cfbd/dofewuwaru.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zujajodibukaj.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/81983020948.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f088b90a33f---resaxupiras.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/24181123950.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080290386f19---lisijaz.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/zesozewotuvekuvonezimi.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-31/20210731075150424420.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d65524bbcc20a1c6a46c6ab159b37490/lilopojis.pdfIn PDF document text
    • https://arerp.kr/data/file///genoxurapana.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a6824d50de4776519c5d67f8b0777da9/83846568095.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/61988474111.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/guzezebafav.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/92308471741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+level+up+your+alchemy+fast+in+skyrimPDF 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 17156 bytes
SHA-256: 2b0e545faf7eff609270035394c7f19b3250222a3f1d4309633d952bc3713e0c
font_01_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 11196 bytes
SHA-256: 9c7e24a6923b47e6eac50d8e4308d4af078dd66f9472ff832181ec9bedc754cf
font_02_sfnt_off00014015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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