Malicious PDF — malware analysis report

Static analysis result for SHA-256 25587ac3ddd01bb7…

MALICIOUS

PDF

94.8 KB Created: 2021-06-28 07:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b71d7c5c80b8281169c7b7b41d105a9e SHA-1: 1b8f8fd49a7e0a757e5eaa339586bfcfa3929c72 SHA-256: 25587ac3ddd01bb7f0b47bbc38901694bfa88a370f4f266df8f97dd71c14f007
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb418c7784---pezekajoziwad.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/13ff84c645aa3a90708c1665ece7807f/19983485429.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51666b3d1---basaliwokofolisigiwujamu.pdf
    • http://chiaranannini.com/userfiles/files/jujid.pdf
    • http://amexeuro.com/an3_Uploads/file/xizinum.pdf
    • http://smflow.in/admin/uploads/file/libudolodipo.pdf
    • http://amexeuro.com/an3_Uploads/file/gijebulejumaruwewagotasuj.pdf
    • https://chung-pei.com/userfiles/file/bupafokofuzizidajuzosibok.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xoxizimejunowovitapul.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ec48e025b6400a545d2f4e101c84ad42/19556027910.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pqca0nab3k9b7ej519f6scpia5/jusikijuwutetekal.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ea17a64a---33995504264.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607066ad142aa---13028733021.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/nl776rmnrraebdhss0mvhsiris/5505601138.pdf
    • https://clumba-indoor.ru/files/files/tivewu.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h3dh29brhfkuv3v87okbsufeqv/27297709632.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93fb5692ce---28974208958.pdf
    • https://anmoul.com/userfiles/file/11317997399.pdf
    • http://acpiindia.com/userfiles/file/47949154624.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff25488f58---wexazurejimelupip.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/905d21e8baf4f3ef77c9daa5bbb4e34e/duzinogemadeso.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070569adb6d2---gidusajudopejuno.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f45b3ec8---74352739520.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l80stsaqs49ddedodhbdoclqnp/17584265377.pdf
    • http://beerskiboot.com/img/upload/file/solob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hard+riddles+and+the+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
font_01_sfnt_off000129bb.bin
e7a8ca581ce3ee817d60c9f37180e52466ef10f46f39c4a51eeb6064c293e820
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 17264 bytes
font_02_sfnt_off000156dd.bin
62cdfb4d0109cd81ebc9b294d5386888afad50b1291791ba4632dff17bab652f
pdf-font-stream PDF embedded font (sfnt) at offset 0x156DD 10304 bytes