Malicious PDF — malware analysis report

Static analysis result for SHA-256 843cc4ecb84f5533…

MALICIOUS

PDF

109.1 KB Created: 2021-07-22 10:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b868dfc8f601d45b61be00a3102c2c87 SHA-1: 9ae86c2c86bb0fe89a54fa40160e87c51ff47f08 SHA-256: 843cc4ecb84f5533d11a782c5dd7c25f5cdf1dcb419e385c1c6ac4195f527e25
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the link farm structure indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/42c865f60a6339c64071a7d3e9028caa/benezabip.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e802e3f50---45056850618.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/4446416034.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/49258490990.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73099eb6c---vubipegugi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/vamibibuzikujo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a6571cfb---xerizux.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qiaa368r7jesjp7hrrardgu6b2/71553455994.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/zuwojulofifa.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/81894965336.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a365020160d---vapudodubelan.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c696009f54deea75f0506ff507d59ce7/33336386001.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47eeff02db---lakezifejatifonosena.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/pujotaja.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/43378985389.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3756348cc---vorelagovusugib.pdfIn PDF document text
    • http://houselandia.ru/files/8869493768.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/12f522e49eae906c6b22792fda941e69/27874875731.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/begosazened.pdfIn PDF document text
    • https://airshow-bg.com/file/xakamozaradubajux.pdfIn PDF document text
    • http://beiks.info/public/file/96957239691.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/26664696574.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/wupuxowixilupesezezukuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=if+statement+with+char+javaPDF 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_off000143b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B8 10668 bytes
SHA-256: 74b7a1105e3e6a1c73b07df00ddb6dc84447da4756fac254e6be712858c09ca5
font_01_sfnt_off00015bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF4 18176 bytes
SHA-256: 88d7085d23064b3e1b7e2972c79418f0cac0f63c7f08bf0bc03fbc6319e82a63
font_02_sfnt_off00018c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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