Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb16c0833208767b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 00:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8e712c9daca07e846cfa7ee90270eeb SHA-1: 0bc7c1935fcc3b291967b609945a47f5b78aec83 SHA-256: bb16c0833208767b73a20d89d2cce7300d46ba7261a9be513ce046cc999fa1fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious characteristics, including a link farm pointing to compromised WordPress upload storage and external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous links and the nature of the heuristics suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=easy+newspaper+collage PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61236954---sibamakupexuvixin.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/8939647249.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/53c291f9f5c532f610109e43c91b6ffb/75091070557.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd66221d5---wujaxitovavunuzo.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wemolunevuz.pdfIn PDF document text
    • https://soechi.id/userfiles/file/24659971740.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/48291503407.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/61328754900.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mefajaz.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mufarepu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8918962a08b92a671b3dc4467806e94/61988902527.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3c652eae17e3aa7e1e41e2285541a1e/gelufew.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097e21b4c2---36279489839.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b109ed3c250---67165789456.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964a1432425---97771387730.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/xugakotuboji.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5f18d9d8---28178625180.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/jeseriwejusekilolozanaj.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/94638123158.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b428997a51e---98305351666.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d452a915---33003384615.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/94626037513.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zadaxaxadonojujeve.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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 10540 bytes
SHA-256: d1eca40bd1358aa01be90fe166944f44056a12a35cc22b6369894e24a64be98e
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 17044 bytes
SHA-256: 32d4c70339db6a0ea7a255bc3a5fa471b2507a235b71eac429bd8f0f858ad77c
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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