Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcff478b532afc3…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 21:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b114b2a3e5e8b1e9321a7e03778b2897 SHA-1: 63999b4f3d7359a1d11740f946357e6cab991e12 SHA-256: efcff478b532afc309c7d2b4ae6f77da99e0a1f2bfaa4637478d131a7e7a7bac
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it is designed to lead users to malicious content. The document body is unreadable, but the heuristics indicate a link farm intended to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/20e3e135815ca4598e5337418923589f/welisamojemofulibabunexat.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e36c6ffcaf49ab12fc8e733124f96456/69958119175.pdf
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/79924476829.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721298166a9---78131396793.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4edfa77e5---ginimeroveximif.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/51303762448.pdf
    • http://mywayrtk.info/userfiles/file/femexosevefud.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f5e24664c164ef487f6e051a29da71a/laxotemebusoda.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ah0tju2aq72u3v92j8sd0sd6aj/verofududewijizaxabod.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73836d73c9a3dfa16da5f22b9fe7921f/21290632479.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/87ca65d1c14a3f6f51c230379921fb70/49205271760.pdf
    • http://csptech.net/admin/userfiles/file/jonafugejavutikuronoxeme.pdf
    • https://cncunse.com/d/files/wugoronotekepefaju.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4e409743---botojajivukoresos.pdf
    • http://euro520.net/userfiles/file/16208384791694571827.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/db5695da1a59e90c12012c5c5e7ba31a/14625386015.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2a5bcef0---tusotajuguxubo.pdf
    • http://aldara-latinoamerica.com/userfiles/file/16628840067.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8cb01be48---67658093140.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9f817683---zaxejefuked.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9f141b7446d543ac347698948f39db68/pedikurubupewofuwoxixajik.pdf
    • https://ka-base.no/images_content/file/texadotonidadiwir.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bae524550b3a08ed4aa1d26c85054d27/sinixevidab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=integumentary+system+includes
    • 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_off0000f423.bin
b738a6096cb80030f9a79a625f713af18df44b787f85d8ce191de37ebcf9350d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 17072 bytes
font_01_sfnt_off000120cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
font_02_sfnt_off000138e3.bin
f0a1c925d235b6fc420925965e624ee043a946b449e2e48c695d67c67a7f05c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 10756 bytes