Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1bd118d7d87816…

MALICIOUS

PDF

97.4 KB Created: 2021-06-25 19:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc149d107c059c2fa0f92293813fe7ff SHA-1: a0c5ad07aeac0146999f33993b646d475bb824e6 SHA-256: da1bd118d7d878168897e6df4aee99b9d9c0dde1d8f180429bd9b6cee66b534d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The document body was unreadable, but the presence of multiple suspicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e1ab815319d8b842dbcbc03a1672620a/43107937642.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xivikijodel.pdf
    • http://rld-carbon.ru/file/resikelinoxawiromawedowij.pdf
    • http://bpabv.nl/uploadfiles/file/pujul.pdf
    • https://study4student.com/cache/fck_files/file/luzodapizak.pdf
    • http://bclgrouptt.com/userfiles/file/sarawefujojurusunope.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091678b24902---wozogafudelex.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b8146b52---punelip.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d462c246f---69949780552.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uq5mc2legmdemp4khenkmts9ac/gejetidoweduvenuvo.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5d7e68e1---guvajukiwus.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7787d6adf5---88977590004.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e782a7ffa210f91f822750d40d4ca678/dozer.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/bufakoj.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093cf650aba1---jojizi.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hq50fd7qegiorafslt9jjq8vdk/36030711390.pdf
    • https://aradovan.com/userfiles/file/luliseli.pdf
    • http://www.asslar.de/downloads/49406502823.pdf
    • http://cohensevents.com/clients/74638/File/zabakedibimotuzetovi.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aui129alhk6qinuc0m6triodfs/tifawur.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1jo2i3f4hn5vcncd51ud114m80/42132984225.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5251f126a---budak.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/lj73k77ut8bm7om60vtn0f72ai/26562630440.pdf
    • https://kham.vn/userfiles/file/47809204436.pdf
    • http://auapp.ch/userfiles/files/90425500513.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+write+unmaintainable+code+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_off0001198d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
font_01_sfnt_off0001319f.bin
c7f13d680e97ce1a8a0df3e88a03a5c070bf2e44a6213b1b43994225b7901b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 17360 bytes
font_02_sfnt_off00015f39.bin
9a0f7739d44c0eab445cb9c93077ad98f5457a0bcc005094e5201b89c0022105
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F39 10928 bytes