Malicious PDF — malware analysis report

Static analysis result for SHA-256 e708fa30def471a1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3dd3339b409e30068a07cb9877dd89f1 SHA-1: 9941d138263b7a0d922bab90ba60d1db531c620d SHA-256: e708fa30def471a17256e1b466e19d3acebb7f58ed6ecf0e517ad790719a59df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected as a phishing PDF by ClamAV and ML classifiers. It contains multiple links, including one that impersonates Facebook and directs to a URL on 'laborke.ru', suggesting a credential phishing attempt. The PDF also hosts links on compromised WordPress sites, indicating a distribution strategy involving compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://laborke.ru/uplcv?utm_term=how+to+delete+a+group+chat+on+android.
  • 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://laborke.ru/uplcv?utm_term=how+to+delete+a+group+chat+on+android PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161316ff12781a---42903933608.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/43258748116.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dakizerefijuz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vru7ugli3bq27oji2vqd7kb8t6/22311994800.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/99625402884.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/zelelafapujupinu.pdfIn PDF document text
    • http://standdominica.org/files/files/tesofobize.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fewetofokela.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/pomaki.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/80222719097.pdfIn PDF document text
    • https://parfumzone.ro/files/file/42387827065.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908210219.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20ea9710064ce626525a719f85a09892/72279925533.pdfIn PDF document text
    • http://js-space.de/userfiles/file/wafenunego.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20644995296.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/20f2fa108f2031a3fb8adf3a520c50b4/92392547749.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138b83fdf648---31085291978.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/logorasigom.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/98545634588.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xoverimurewawadanexesuf.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/79043670721.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210911052940872.pdfIn PDF document text
    • http://allier-genealogie.org/File:/64319340940.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/lojesitujidof.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/6161151143.pdfIn PDF document text
    • 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10804 bytes
SHA-256: 69bc4897d844bd6049499e48d8521beb331fd77ed0b299249f11a068e61c3f9a
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 18024 bytes
SHA-256: 4e66f819493520a0f8bb549453a7f4799712e90291080c3bbe67fccfee638316
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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