Malicious PDF — malware analysis report

Static analysis result for SHA-256 3572da299bc52b7d…

MALICIOUS

PDF

97.3 KB Created: 2021-06-25 18:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f777ced5f7084e9a27353364ceeab141 SHA-1: 992caa4c7556727bbf8cda883eb352c3be836e01 SHA-256: 3572da299bc52b7dd176110522d399edd9966df1ca6539dc26db2a7bbf2e3402
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://catamma.ru/uplcv?utm_term=most+touchdowns+by+a+tight+end+in+a+game
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49b5ce7738---68426464250.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d97a11bc---56585181219.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/75fefe4052454c095658df776e623b71/71556143831.pdf
    • https://faresaldabbous.com/uploads/files/mitan.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/239d5c0fa2792f3ec84eb8fc8df7bd3e/bikaweta.pdf
    • https://alakharia.com/public_html/userfiles/file/61354669163.pdf
    • http://aep-tc.com/cache/fck_files/file/15743103075.pdf
    • https://atamergranit.com/userfiles/file/zasetegilajet.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf3b05e8f1---66836549788.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955d8a53f9---nodufaniwat.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0871c1d500fab7930bd96edbbf4f213f/pidomas.pdf
    • http://illinoislivestock.org/userfiles/file/69187412973.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609497b34a7e6---fuvumuranabisop.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/60f0aa73777f4d4bd1cc3cbed8db05c3/selozusogugejoxexonif.pdf
    • https://susta.vn/userfiles/file/potiv.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0uq4sfuepp7pnorggi8518qfno/giwuzorijeforufadaweba.pdf
    • https://acronimocostanzo.com/userfiles/file/fizopuzevuvisefo.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b3babee150b---xafofevezetutida.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0809e0042---jebinumuwoxulaginujefi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b538c57e26---70455812256.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cdd0f1a72f93091450b2b6862bf5ecc1/48540017519.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49e93390c---xifepajadiwusematajef.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52897195361.pdf
    • http://bettynblue.com/upload/fck_img/20210522/file/kumezozaralinufe.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b4fa19ae9---67487320081.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200d501200---39960133686.pdf
    • http://akcjonariusz.com/UserFiles/file/zowokanuti.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_off0001157c.bin
dbbbe07838f2efab6e959c199d2acd5dd2e7b84ad064933ce821df6bc930aae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 11104 bytes
font_01_sfnt_off00012f24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16792 bytes
font_02_sfnt_off00014736.bin
e0e7b5345d3b0cd91afd634e555e7e87dd01453573da62517e72fb966552e88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 18348 bytes

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