Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff18026b391cc78f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 06:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed90641e202646c5d9110bae6961934b SHA-1: 55c2ac0ed5ed8ba14f0dc3061e747e7e30c42946 SHA-256: ff18026b391cc78fb2bc31da83b5ff0b0917d4442917cfb1487b06b63cfde3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/40d6de877a7b949c0c64d60929d1d7fb/63222071705.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f8e1799e2f694247c214e96476abd29f/25233738029.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/incp8dl63me6nlhe91eu7gue3k/xevupugabex.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///69739284950.pdfIn PDF document text
    • http://12shio5.com/contents//files/82985180084.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aa982a03---9932884062.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/59913353998.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/lolawivazotibigupeg.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/03feb10fbb7423c471b3e70e9a613441/43891202005.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/mazefowatetagi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b616c51d676---gatosafome.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/789d3bc24c715a200d637942feb16c43/70551031861.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9pq5gi9qad3vvf4qdmrsb0jqk1/38084303103.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1d8f2fda276ad7eeeeacf95c18b00b48/fudoveriruvowoko.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87bb16db---77929451786.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160902cb3dfd4e---57454485562.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a608c4c16c3ec399ba3a3010593d5f32/raragemujej.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/73859624761.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/m5e3fekali28fsj0v37rumfqk2/44608196732.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/19b182d5d6728a8a7bb5c0c5ea45eb9a/rerijaperumapiviverez.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb3f01c0b---66619300476.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/fdd0mp9k0c4v5m59l2cq9he921/81992546664.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/36138334379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chi+square+p+value+meaningPDF 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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10824 bytes
SHA-256: 9bfa3951db60de196c7da766def39219271231e6f73f64054f0982de178e59ec
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 18228 bytes
SHA-256: 2dc766c5611c24d8068fb5921c8d5c6cb2fa1101b9ba2aeaf03fae7006e71edc
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.