Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab9318928a1944d…

MALICIOUS

PDF

77.9 KB Created: 2021-08-20 17:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ccbd3ff6589a545fa0fc9fe188924e7 SHA-1: dd37d9a3981446c7337d2d18c1f759c208a06be3 SHA-256: 5ab9318928a1944de91c253ee09424c0c8eb7fbcd2d8ba8d175faaad5710b0d2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to distribute further malware. The presence of multiple external URLs, some algorithmically generated, supports the attack pattern of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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 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://philabc.ru/uplcv?utm_term=movimiento+circular+uniforme+ejemplos+resueltos+pdf
    • https://honghow.com/ckfinder/userfiles/files/zusanazarun.pdf
    • http://gildiamasterov.ru/userfiles/file/temopujidijogepemor.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/deserasusofo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcf61a707---vesutimos.pdf
    • http://bagliodeimille.it/userfiles/files/pakopokoligeneriwet.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1625570544.pdf
    • http://karate-talence.com/newsite/userfiles/files/vowulenivo.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/duvawa.pdf
    • http://blankheich.de/images/uploads/file/gosajudi.pdf
    • http://lelit.nl/app/webroot/files/userfiles/files/59447184317.pdf
    • http://robbes.nl/media/files/gapaxotopepokodapo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1ea4ac77---85320723949.pdf
    • http://chizclean.ru/files/fck/file/verasifawiguduraforiz.pdf
    • http://centroolosprato.it/userfiles/files/56958468388.pdf
    • http://agataklimowska.pl/userfiles/file/43335116428.pdf
    • http://qazaqbanki.kz/data/content/files/zujateruxugupadoron.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lovavuwukunasuzupo.pdf
    • http://soyaksiesta3.com/userfiles/file/51538924887.pdf
    • http://nordicaluminium.ru/userfiles/file/11879844426.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/t03h5llqhe5op4jgnkq65dp99d/kanosukawadoxogijewewori.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749584ed0f8---44839105772.pdf
    • https://fultoys.com/userfiles/damijozipolefebi.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9990c1ca3---77263822054.pdf
    • 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_off0000caaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
font_01_sfnt_off0000e2c1.bin
0a2d0efa7557bc89d70996e9ad914cf1cf7a13293bcd9f0cf5ad32af1c563b61
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 11072 bytes
font_02_sfnt_off0000fc85.bin
73b008b6b1c772f2314cca59f12439615a8d465c7f1f1474535d853657db7a77
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16668 bytes