Malicious PDF — malware analysis report

Static analysis result for SHA-256 63444e34d2c33dc3…

MALICIOUS

PDF

104.2 KB Created: 2021-09-01 20:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4f88aef1cd8f11f9d6aaf320814b6c8 SHA-1: c8af1cbaed05f84faccf2bc7b255d488e1876047 SHA-256: 63444e34d2c33dc39e3d0605e1c7954231cfa2b90e0df190790c3bf61be3413b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://clairvoyantinfotech.com/demo/images/12360161202.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079c57f4f320---84706016699.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/20435035853.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ert5kfg479466qljt614rgokih/65776801357.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117f8533c6ed---67488222891.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/82213081142.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/dimoxavijigupamuxovup.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/81561484765.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5a3ec4ef7008cf6e958b94f0068b9b30/wumelafovimozanumo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/38712880733.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f8d7d8ffe---banowagonubej.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rumiro.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071128939857---jotilisowenavuwipetev.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/11308954508.pdfIn PDF document text
    • https://asiabiru.com/contents//files/32346679588.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/nanibep.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cf27312f---vefewotuwubaraneni.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/firal.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/67868173509.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70379994692.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///54489260846.pdfIn PDF document text
    • http://limoride.net/gallery/file/betejelowuwo.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/kogerew.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021731135922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=step+2+nbme+form+6+answersPDF 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_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 20136 bytes
SHA-256: a29a95c88e97cd517aae703ebeaec8c9c9577bcf14cbdde479ee2e5ad5b1a8fb
font_01_sfnt_off0001607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607E 10968 bytes
SHA-256: 2bcb07694345eb829bf7b936511743eebf4f2718741aab2b370e8c7dae058a51
font_02_sfnt_off000179dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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