Malicious PDF — malware analysis report

Static analysis result for SHA-256 687b583184ff0862…

MALICIOUS

PDF

97.3 KB Created: 2021-08-13 03:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b533e1256aebdf8e75eba59ca55522aa SHA-1: 4f3a753af4e646e201ad6834466b138d10beb54e SHA-256: 687b583184ff0862cf1d46d1ca9cb22d78e2c7ec846e7d4cf98da3a3e716bf8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://fqcycpa.com/jingkelun/userfiles/files/20210616002053.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7e6a6650c---11249400813.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/magorunefatikatabesuxa.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/1560526696.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/41832619004.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wogogijulaboje.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/817307bbc268bfec8ee26b1ca88f1e82/kimisaposirabalipumapu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111234985b1b---wasikokowinivave.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/kogukozorikupo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4088b3616ca6f2229fb108a04f1fc4b1/75654252787.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/17279221110.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/45107a60346f74cca87603373041cfc6/kerajulik.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/fudadiwur.pdfIn PDF document text
    • http://fedoro.ru/upload/file/42027760375.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/37369407981.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe99dcd45---vizovovolixejofumov.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/54826409407.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/60035363617.pdfIn PDF document text
    • http://sowitech.vn/upload/files/xuzovogesega.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92c3cfb16---24295951939.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/69438589490.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9fca3a50---35739763763.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2jrmu7l3o5futu90krl4piiocp/litofemuwa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3456dcc23577606a62780c566702ecc0/fazaburawuxujunax.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/sapukogelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=calculate+the+enthalpy+change+per+mole+of+baso4+formedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 17208 bytes
SHA-256: 6e64d0eaf1804ad5a9af92371642a1ff7586948dd69caa9c7897d998ea573db1
font_02_sfnt_off00015c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C00 11440 bytes
SHA-256: 1e84507283db105629ed5b1fb42097a8057b59325849f329861e74bf90db76f5

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