Malicious PDF — malware analysis report

Static analysis result for SHA-256 42350ae6664d529d…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 00:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c2e8ed0d67cbaee0f3ff743a147164a SHA-1: 091446b72111da12f486c4046465770c57cd6031 SHA-256: 42350ae6664d529d18ceaefccb19f1f5c0a7bf54f59d10982da2d3147f12e4a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://ovalpolycoats.com/media/pekerevulupara.pdf
    • http://alliance-ltd.com/userfiles/3064588785.pdf
    • http://alexlunacoach.com/img/editor/file/mekimolefipobonupe.pdf
    • http://myphammonly.com/luutru/files/tejijujogedezubebu.pdf
    • http://abbwingslynnhaven.com/uploads/files/gawegupinozerofazididej.pdf
    • http://a-mega.ua/images/uploads/file/38452528138.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/setifesiwozidatoxazujitek.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/scqa2ht4cqs371fp7hn1slu6r1/1330167201.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3765e47e---nijuzufuwanokonuvopotu.pdf
    • http://drairtools.com/ckfinder/userfiles/files/15031545102.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db78f356e---xutage.pdf
    • http://stin-verdon.fr/assets/Image//files/nobebunu.pdf
    • http://vasvaripalmuzeum.hu/upload/file/jatelovitil.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42a476908---66555263129.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0mljtop40arh5vsr6vo796nbao/xoriwerijizexiluk.pdf
    • http://bocghedanang.com/media/ftp/file/27551280687.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/91017n6ah10tbe7o4n4afm8v22/50631236881.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546f13dc87---kuwibulaju.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced168cb7---67780689532.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c105560ce3f---pojakuniwi.pdf
    • http://lhsclassof1971.com/clients/74120/File/tenadonef.pdf
    • http://yjccnc.com/upload/files/lovagonafevagov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=class+9+maths+chapter+13+exercise+13.8+solutions
    • 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_off0000e74d.bin
d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16088 bytes
font_01_sfnt_off0000fc84.bin
82a633aab1df268c858b94fe3c5e9586a029fae2ac1eae98bbccb647ab51fb38
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 11536 bytes
font_02_sfnt_off000117c3.bin
30bf9893020abe257ac0d7e2ef27b2b483f105ea07fcd038893e1363999e6675
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 18128 bytes
font_03_sfnt_off000147a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 16792 bytes