Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a92649ee78dbc40…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 10:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3f0532fa1a3661b8fb1b670412a5276 SHA-1: 29bbad9c3cc5959dd2fd762e48a54220bc56ec3a SHA-256: 1a92649ee78dbc40b5dfd6da32463ae836a26e8bee0d2ee37a74db5f9fec3e20
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of multiple external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kxqcgs.net/filespath/files/20210804223337.pdf In PDF document text
    • http://blgjad.com/upload/files/kerabamokebexewikirufesol.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cqe118enb9d3ab9ogarbe41mpq/69079980165.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bba02836e---52388459732.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/26884706937.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161268621eaeba---5931274977.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3cb6ec44c307671c02cc6396a60727e4/ridapokaxa.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210626_0ABD24C671267DB5.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/91027132030.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/dumonosewamudozote.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbf001db4e---80250835841.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/46558224093.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tubilemu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a337a05e3d3---pukodamuxadetoj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076092d25aec---penukivajo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/rekojapi.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/zonofe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868c6c6c2ff---89259959858.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb89061a28---wekabikotorupiluvadaribit.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/boxudof.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5e4c555a---deribonebevimisenodev.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/xoguzitudosekezu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/13f714eae17fc5c4d9810056889724c6/tutijizarisuzetisigi.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/betemupuropedugelokujotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+say+we+in+aslPDF 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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 18264 bytes
SHA-256: 5ce3e2c1c7626a351dc2bbf72f8c0c2f53ca723ad69225b44a6909255d4962a1
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 10192 bytes
SHA-256: c844661cc63e63c6754cb62ef3fa9cbbf8aad7ff5f7c10e611068579c84210b6
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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