Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28f30c57b74dbe5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 170682c63ac8782ba0df3be0562890f7 SHA-1: 67d1ff9b722b4745485cf32e93f8ef2c0b71348e SHA-256: d28f30c57b74dbe5b637b15ba5a2af9ca5fbc120bab80a3ab310bacce9b0e674
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious destinations. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=jesus+loves+me+hymn+pdf PDF link annotation
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/89239078994.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/24576409833.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/28/valibiralo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9j8ej3udp9b9hbi1j5epv2ju2c/dunaxepitota.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/64849424745.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t5h5v2j6dhlbfp0vclbi2ar6t0/raworejituzalim.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/zikonexu.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d7157047a77ca0aa6424ad942275f448/94332591714.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611dfa52d9aef---jedixoputigigenelanetili.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2a1e11be---nivufomuzod.pdfIn PDF document text
    • http://techbis.pl/files/file/misika.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/sizatizozepiresukudajib.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/80421105652.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f395df981955259790a117454ad11122/pasapuresavolugoposupile.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/puxigirojisimabada.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/33256974412.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/10223850386.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xavokaniwofutagu.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/relanuvoxowodujamopi.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/52327740352.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/52e42e428511a15c0f73588dd187526d/5774679721.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6nqqjfn9k65rpp272vbkba2am7/86171059132.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_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 10584 bytes
SHA-256: 9ab9bccbd96e96045f787d1c0f30ed10a7484427649396b3b69e90ddbff58411
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 17440 bytes
SHA-256: 682e3d1d00aeb7a9caa4442ac6f02d7a2d91d9d8794d45f3bf713c7fe5eaf574

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