Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fa67aec773f722…

MALICIOUS

PDF

85.8 KB Created: 2021-08-18 17:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11c4dab87e0ca29890380238096f7ccb SHA-1: d17899b0ee8dafb7ddcd498c1ea242795b0d5eaa SHA-256: 78fa67aec773f722555b61c500e864bafc5a6ff516b35d63b08c84c539ad0e37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89551dd4f4---nugaxobagofos.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4cnua4ss1f12upeamk6lj4ot2a/3841352828.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac707455bd---poxetelifepuwitejap.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd85d4394b---podaviloxemekeriwazimuwu.pdf
    • https://angkortaxiservice.com/userfiles/file/97101000889.pdf
    • https://mysmartedu.com/uploadimages/files/fitomuvadigesazoxoza.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b35c2c3509a---sizalaxagizojeraxoluletez.pdf
    • https://soudurelauziere.ca/upload/editor/file/12367462407.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6539290bb5a9076f31a1e615c567cb11/mameregojamesa.pdf
    • http://giustizianuova.it/userfiles/file/9712532486.pdf
    • https://akproauto.com/nbloom/fckuploads/file/27688766736.pdf
    • http://dancephoto.ru/userfiles/files/zilegopogegekezexiwutexug.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2927a4f0---44022879827.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd81f6ab38---daropupitivo.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i2ci25phf32d6b7nlpmtqc7nk3/luvupetamupi.pdf
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/im6iftks453i0el2f860bf48sk/bosazizoxemezaxudom.pdf
    • http://alliusie.com/userfiles/file/xifopewikiberanumekez.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/65eb87aa12fcb83454bbd2b793039a48/wamasulenajigavakoxa.pdf
    • https://abofahed.com/userfiles/file/ruzubotova.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/26048028978.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/42705466641.pdf
    • https://airshow-bg.com/file/lizatibax.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/seriredumapejup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=itunes+download+for+windows+vista+home+basic+32+bit
    • 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_off0000e8ae.bin
40bd7a3f7359ac5496344691e7ab0353335591e8cdd81aca0f9eadee75a2bfe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 17248 bytes
font_01_sfnt_off00011606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
font_02_sfnt_off00012e1d.bin
d423a2c771cab292d7fb8b54742280cf8e41f4e849fc87ef5aeaa9e8b40299b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 11376 bytes