Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3e8b7b3b7788aa…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 04:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f5372c82ea7720b6cbfb49b3d3de454 SHA-1: 0d319668276f339e4f7612a889b88602ea4ed5c6 SHA-256: fc3e8b7b3b7788aafc6bd4edcfe1788656cd073365679ca282b334bc7f8ae07e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525d469e6---xafofenukuxugepomomikewu.pdf
    • https://alnahamgroup.com/userfiles/file/wupamuserasugegolafob.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2fd3289ad26e697b383eb326de587095/morewazis.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609220068ef5c---87161828971.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/227a1e56526599bcf935a6623c60b5c7/gadotut.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a34582f2e87---39364382489.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5c7480801308077e7960fef0b473c230/gasomagipuju.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e37c2246---risinofajejozevuteva.pdf
    • https://rajaunited.com/contents//files/nepuluwemulafap.pdf
    • http://kameleonhastanc.hu/files/file/46293031313.pdf
    • http://gokea.org/upload/editor/files/dekuxebu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd72208ec8---piwupedefisogosopubar.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f445b5eed2---3198685580.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b92ac3f9---lebubulelizojuzamabotib.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f5764251f10df0b40926be82e9488e0a/8662205764.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/phb7lhp04tijr7rp1ventuch7h/lowekivarumetenofexatik.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec5b3e22e---98095647254.pdf
    • http://files.ibiza-ferien.de/file/bukopukalijikeboxuzir.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/965ef41293fbac76ebc9630a8cbd58d1/5883237770.pdf
    • https://wodepcb.cn/uploadfiles/files/62331369335.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a910073d13---73270756763.pdf
    • http://files.ibiza-ferien.de/file/zavizoxe.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc4133b4e93a26fadba51fcaacead63d/282152407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pocket+watch+tattoo+meaning
    • 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_off0000f217.bin
fdb7ad9cd83e2eb7ab85c05cd3e88bd42878b1e12baf41ce3754c367d605f5fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10540 bytes
font_01_sfnt_off00010a09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16792 bytes
font_02_sfnt_off0001221b.bin
17a3a79390e78a176cdebf1f9f37db6f9d4604ade92cf28974f46a21572c0e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 16364 bytes