Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77910138c6d5387…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 10:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de2dbf24c66b800e8f61bd45223d19fe SHA-1: ee4decc562bc55bd491b909347c9ce86d76a7600 SHA-256: d77910138c6d53877122d17f76be084970c6f8e1e5aa33b8951742981e18b971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://wastran.ru/uplcv?utm_term=street+cleaning+days
    • https://astek-telem.fr/userfiles/file/51385157654.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu3fp7tm3qdaetoe0a5h395gf8/movumaperaxexabunaziv.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5pm02a1tv29all5fsnaecvsc56/jiwoz.pdf
    • http://usmleworkout.com/files/file/32998568183.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738ae375b9---wigikaxirovemaxori.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5ee1ccde7skg52k4gr48mbms6/kogudepasirujudulokul.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f397137f0c---56852862066.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18383d5da4---37963393948.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc463f015e---87171838967.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c59d4b38---balifap.pdf
    • https://champion-osk.pl/userfiles/file/dedudanebidutasowesibadu.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b28cb318199a01d308dd549fa6a97227/86504258889.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f64465941---6443553217.pdf
    • https://landi-bg.com/images/file/memebodo.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5b5b05f2d9fc0a2223d7f6c61bfc5321/zokojojitarifu.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ls6o8cqgm94d6lcihr7gfar2hs/9645285408.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/doxizedidavulebezarewu.pdf
    • http://atthaya.com/file_media/file_image/file/26515551075.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cf3ec4c6a2c5ac8bd194b51c41c631ad/jataravijoziwelufiwu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/eptrv5v52dejfodlu4qs19u9e0/parojerumezeromo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160703eb160259---xoviruxifikufukobedazot.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70082a60e---59394199091.pdf
    • https://pasarantogel2.com/contents//files/46197537170.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e516.bin
0d63247c647e3f8b32ef26d3d22f2926769107643c49f1ea84773a23126f2074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 17632 bytes
font_01_sfnt_off00011381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 16792 bytes
font_02_sfnt_off00012b98.bin
daf82ebf8788bead441b0bd552f16a1372b344a6990df438c78c1a217c029fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 10612 bytes
font_03_sfnt_off000143bc.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143BC 16312 bytes

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