Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bbe954027c9e1…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 06:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9d2d0baaa4522b6ab1814e7d89c2270 SHA-1: 4f641bffb9978280cc7c01f9b10555e3c8baea47 SHA-256: aa3bbe954027c9e1c8efa10a0c62033213baf2e498ffd1b031c40368e0bb47de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/d0gc7lhenhcjs3tsepen71l67b/28441841302.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/darofenekim.pdf
    • http://iaestedresden.de/userfiles/file/23234565744.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/23entaoa4l8v1o4q8148fmln46/dekikirex.pdf
    • http://bukharaatlanta.com/sites/default/files/file/61800749065.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b24f26a38---jozedizigibafekaforo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee846b7fa---diliruguxuzopogadozig.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d666f02369f---41175992717.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/46929322071.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9ca75c32---64278259402.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870d7702134---79500340181.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1e641362f32b3ae4b8cfbc4f3959c737/tubulozurakugi.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e5a6f8d2442f1d7ac2e4ffbe9f1bb290/77431208779.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1c3445d9---gakubovinigejesisirapa.pdf
    • http://musclecar-taps.com/js/upload/files/54741270586.pdf
    • http://amon-syotengai.com/userfiles/file/kirukidutijavixetesimug.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba39f0276---vonufafezaxu.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76347895307.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/771707d3423177e6fe49c3c54447ab74/nojusizazipivuf.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/81957386789.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16089e697b5a12---xosogevosovonodavejogox.pdf
    • http://olgapolyakova.com/files/files/85363100732.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a89e838a7---kopobimunepotibolowu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d0766a55893e72ec9d97293fdca2fa49/susilag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=all+dissociative+disorders
    • 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_off0000fa4a.bin
7d3db9801dd86de08b88007801ebeadbde013452fdb310edc1ba77a1d95292a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16824 bytes
font_01_sfnt_off000125a4.bin
3ba0be4dc81b2cfc34ff0f7cf44ec5b1d70663ce0aeb5c1e2b174618adfa80bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 10308 bytes
font_02_sfnt_off00013d09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 16792 bytes