Malicious PDF — malware analysis report

Static analysis result for SHA-256 afacbc47f9e60ba0…

MALICIOUS

PDF

107.4 KB Created: 2021-06-28 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ed171e2134fc4e0e34bdc3362a750bf SHA-1: 4ac91252d86ab33710dd8c29e793282a7d92f79c SHA-256: afacbc47f9e60ba07a7b5bb4d8e5586307c1db4a2a4b6b33a0ba57c293465c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or spamming. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+import+pdf+file+in+indesign
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4kpl8v1sbhk8pugko0t0k11en8/kipigidanujarunazub.pdf
    • http://bestbuyfromindia.com/userfiles/file/dikedupukegujagaluk.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/35011160831.pdf
    • http://eortak.com/img/fck_temp/file/muburodavi.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/2878860821.pdf
    • http://consulcongress.it/uploads/assets/file/66953472665.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/25925587754.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/09c11b7eb758f45550674aa8b79e0daa/binelimu.pdf
    • http://sillajen.com/fckeditor/_upload/file/naremodiruvozagofaxoxisud.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbb96edae---fujiso.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/afeg3qn08mgmsluheiaqpb0573/29158405221.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/podaze.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ee067b2e96b55264c5f95da807eba9dc/pupitukuxasosugexuwep.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ofuujchkkb4tl7nqftpc8uv04a/35474636865.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b215a09512416986c73f4e91df01deff/detej.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/418ff03f99bcce4f325f6cb02b8b7679/nokefi.pdf
    • http://digifast.cz/userfiles/bufawifokajomanofudivatob.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95718305a---vijosipewulalowume.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gatupusemugejufubireduto.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0584e50ed---zedemuturomawul.pdf
    • https://laps.pl/userfiles/file/xamizewu.pdf
    • https://limsurdua.com/contents//files/84901693202.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8829cff3---nazekozifogodidapot.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_off000140a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 16792 bytes
font_01_sfnt_off000158b4.bin
ea55f051f01aabfe19d40d60a9cfe336cd4ce8cc0584eb87277cde8a560c6791
pdf-font-stream PDF embedded font (sfnt) at offset 0x158B4 17424 bytes
font_02_sfnt_off0001862c.bin
d9c29f3af1f4c49bfce146fc59009cc45ce12e7fb2167f183687f9c072e0e5f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1862C 10756 bytes