Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9627e16ca3e5cf…

MALICIOUS

PDF

83.8 KB Created: 2021-08-17 10:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70656a86eefef9c78353b57018e6fc35 SHA-1: 69efc949db4c0573d20de45a849bbb520d29eca2 SHA-256: 1f9627e16ca3e5cf320b2130ae7efe5a8adedb22d84fabf49b8defb10f4e9887
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/zefojezowufibalamekepudit.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/regujeme.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lfv871ihcda4e2d3ir89s0v7cr/wumugana.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/95233064973.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b9303962---67543381389.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ab9d52cb---10341726061.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/34093673309.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9570c09823---lavafavoxerovopokos.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f879ed8c57---vibepus.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/69459d96ea00aec00887c3728613c4ec/xuzolugilowavev.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/76175701445.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/3613698167.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/demixolasaxukemisu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/97683799653.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/zivog.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5f4cde8c5cdb0926b8dfd30a48903076/palajaravijatabubawu.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/kaduxamobo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/79081717938.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/gho780lmpl4b1q22o7vtvgc61j/92655066241.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/ximagakazidabidopa.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/13787261571.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/daximufumidizufexilipaje.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/bokiforonemawevoxunevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+principles+of+colorimetryPDF 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 10852 bytes
SHA-256: d0b1b654aef5d4b4186a0eb39116a8aab524e4180f010c39f885f1d3203066c3
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 16964 bytes
SHA-256: 029bf8692475c192cd935481577dbeec9bfb2c4c4994e347d997c49515120388
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1