Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e1ea2500310653…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05c2c5d93d5ad20dd9e30f5ea84f2baa SHA-1: 939c632c23f8c6de1b75085bb8abb4b98ba20dd5 SHA-256: 04e1ea25003106536d6659e36ac412e2cb422cf0bde871f2a1a62ea05a8add9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908032959.pdf In PDF document text
    • https://elperrocallejero.info/ckfinder/files/4840718517.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11164739501.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/54509839509.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307958c29a7---64163515315.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/jeribepunotuwu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dae144e22ab315184398d0d9503320bd/31422300203.pdfIn PDF document text
    • http://pnalog.ru/images/file/70586987860.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36474080229.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/rikatinajafip.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bazuxazulirev.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xirumujebeka.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/41297407891.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/23185876451.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/62297908119.pdfIn PDF document text
    • http://ibb-online.ru/f/file/16394874386.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/najimubofag.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/08463feefdb4a0c23ebf497318a6a4bf/rojakiwutew.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/puromojamidudobige.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/fofutajasowanoruximopu.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/zovewidariwawa.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210909084958_v8au0o.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c36846ec---womevanane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=summoners+era+mod+apk+unlimited+moneyPDF 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_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 10936 bytes
SHA-256: 2de3aaf786a52f3be23ecbbea5e9ed8053ddbfccc672857960ee797f0e7855df
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16112 bytes
SHA-256: 43284d170f60ccb670a5403cecd5e572824c6ff79bd86cd3a9c2159201b37dc6
font_02_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1